Researcher Database

OHFUJI, Hiroaki

FacultyGeodynamics Research Center
PositionProfessor
Last Updated :2020/07/04

Researcher Profile and Settings

Profile and Settings

Name

  • Name

    OHFUJI, Hiroaki

Profile & Settings

  • アバター画像URI

    https://researchmap.jp/read0204812/avatar.jpg

Affiliations

Affiliation & Job

  • Section

    Geodynamics Research Center
  • Job title

    Professor

Education, Etc.

Education

  • 2001/09 - 2004/10, Cardiff University
  • 1999/04 - 2001/03, Niigata University, Graduate School of Science and Technology
  • 1995/04 - 1999/03, Niigata University, Faculty of Science

Degree

  • Ph.D.

その他基本情報

Committee Memberships

  • 2018/09 - Today
  • 2018/09 - Today
  • 2017/02 - Today
  • 2014/09 - Today
  • 2015/09 - 2018/09
  • 2011 - 2014

Academic & Professional Experience

  • 2016/04 - Today, Professor, Geodynamics Research Center, Ehime University
  • 2012/04 - 2016/03, Associate Professor, Geodynamics Reserch Center, Ehime University
  • 2007/04 - 2012/03, Assistant Professor, Geodynamics Research Center, Ehime University
  • 2005/10 - 2007/03, Assistant Professor, Geodynamics Research Center, Ehime University
  • 2004/11 - 2005/09, Geodynamics Research Center, Ehime University
  • 2004/11 - 2005/09, Postdoctoral Fellow, Geodynamics Research Center, Ehime University

Research Activities

Research Areas, Etc.

Research Areas

  • Natural sciences, Solid earth science, High Pressure Earth Sciences
  • Natural sciences, Solid earth science, Mineralogy

Book, papers, etc

Published Papers

  • Comparison of enigmatic diamonds from the Tolbachik arc volcano (Kamchatka)and Tibetan ophiolites: Assessing the role of contamination by synthetic materials, K. D. Litasov, H. Kagi, S. A. Voropaev, T. Hirata, H. Ohfuji, H. Ishibashi, Y. Makino, T. B. Bekker, V. S. Sevastyanov, V. P. Afanasiev, N. P. Pokhilenko, Gondwana Research, Gondwana Research, 2019/11, 1342-937X, 10.1016/j.gr.2019.04.007
  • The Ni–Ni<inf>2</inf>P phase diagram at 6 GPa with implication to meteorites and super-reduced terrestrial rocks, Konstantin D. Litasov, Anton F. Shatskiy, Daniil A. Minin, Konstantin E. Kuper, Hiroaki Ohfuji, High Pressure Research, High Pressure Research, 2019/10, 0895-7959, 10.1080/08957959.2019.1672677
  • Reaction between Forsterite and Nitrogen Fluid at High Pressure and High Temperature, Hiroyuki Kagi, Toshinori Kubo, Ayako Shinozaki, Taku Okada, Hiroaki Ohfuji, Aiko Nakao, Geochemistry International, Geochemistry International, 2019/09, 0016-7029, 10.1134/S0016702919090040
  • Ultrafine spherulite Mg alloy with high yield strength, Masafumi Matsushita, Kohtaro Masuda, Ryohei Waki, Hiroaki Ohfuji, Michiaki Yamasaki, Yoshihito Kawamura, Yuji Higo, Journal of Alloys and Compounds, Journal of Alloys and Compounds, 2019/05, 0925-8388, 10.1016/j.jallcom.2019.01.080
  • Origin of milky optical features in type IaB diamonds: Dislocations, nano-inclusions, and polycrystalline diamond, Tingting Gu, Hiroaki Ohfuji, Wuyi Wang, American Mineralogist, American Mineralogist, 2019/05, 0003-004X, 10.2138/am-2019-6699
  • Crystal chemistry of K-rich nepheline in nephelinite from Hamada, Shimane Prefecture, Japan, Maki Hamada, Masahide Akasaka, Hiroaki Ohfuji, Mineralogical Magazine, Mineralogical Magazine, 2019/04, 0026-461X, 10.1180/mgm.2018.133
  • Microstructure and room and high temperature mechanical properties of ultrafine structured Al-5 wt%Y <inf>2</inf> O <inf>3</inf> and Al-5 wt%La <inf>2</inf> O <inf>3</inf> nanocomposites fabricated by mechanical alloying and hot pressing, Tatsuaki Sakamoto, Shota Kukeya, Hiroaki Ohfuji, Materials Science and Engineering A, Materials Science and Engineering A, 2019/03, 0921-5093, 10.1016/j.msea.2019.01.091
  • The Fe–Fe <inf>2</inf> P phase diagram at 6 GPa, Daniil A. Minin, Anton F. Shatskiy, Konstantin D. Litasov, Hiroaki Ohfuji, High Pressure Research, High Pressure Research, 2019/01, 0895-7959, 10.1080/08957959.2018.1562552
  • Synthesis of nano-polycrystalline diamond from glassy carbon at pressures up to 25 GPa, Tetsuo Irifune, Chiaki Ueda, Shohei Ohshita, Hiroaki Ohfuji, Takehiro Kunimoto, Toru Shinmei, High Pressure Research, High Pressure Research, 2019/01, 0895-7959, 10.1080/08957959.2019.1700981
  • Deep-ultraviolet near band-edge emissions from nano-polycrystalline diamond, Ryota Ishii, Rei Fukuta, Fumitaro Ishikawa, Masafumi Matsushita, Hiroaki Ohfuji, Toru Shinmei, Tetsuo Irifune, Mitsuru Funato, Yoichi Kawakami, High Pressure Research, High Pressure Research, 2019/01, 0895-7959, 10.1080/08957959.2019.1702658
  • Strength and plastic deformation of polycrystalline diamond composites, Yanbin Wang, Feng Shi, Hiroaki Ohfuji, Julien Gasc, Norimasa Nishiyama, Tony Yu, Timothy Officer, Toru Shinmei, Tetsuo Irifune, High Pressure Research, High Pressure Research, 2019/01, 0895-7959, 10.1080/08957959.2019.1695254
  • Conical support for double-stage diamond anvil apparatus, Takeshi Sakai, Takehiko Yagi, Ryosuke Takeda, Toshiki Hamatani, Yuki Nakamoto, Hirokazu Kadobayashi, Hideto Mimori, Saori I. Kawaguchi, Naohisa Hirao, Keitaro Kuramochi, Naoki Ishimatsu, Takehiro Kunimoto, Hiroaki Ohfuji, Yasuo Ohishi, Tetsuo Irifune, Katsuya Shimizu, High Pressure Research, High Pressure Research, 2019/01, 0895-7959, 10.1080/08957959.2019.1691190
  • Reply to the comment on “comparison of enigmatic diamonds from the Tolbachik arc volcano (Kamchatka) and Tibetan ophiolites: Assessing the role of contamination by synthetic materials” by Litasov et al. (2019) (Gondwana research, 75, 16–27) by Yang et al., K. D. Litasov, T. B. Bekker, H. Kagi, H. Ohfuji, Gondwana Research, Gondwana Research, 2019/01, 1342-937X, 10.1016/j.gr.2019.09.011
  • Pulsed laser irradiation as a process of conductive surface formation on nanopolycrystalline diamond, Rei Fukuta, Naoya Yamamoto, Fumitaro Ishikawa, Fumitaro Ishikawa, Masafumi Matsushita, Masafumi Matsushita, Tsuyoshi Yoshitake, Hiroshi Ikenoue, Hiroaki Ohfuji, Toru Shinmei, Tetsuo Irifune, Japanese Journal of Applied Physics, Japanese Journal of Applied Physics, 2018/11, 0021-4922, 10.7567/JJAP.57.118004
  • Elemental composition and ultrafine structure of the skeleton in shell-bearing protists—A case study of phaeodarians and radiolarians, Yasuhide Nakamura, Izumi Iwata, Izumi Iwata, Rie S. Hori, Naomi Uchiyama, Akihiro Tuji, Masaki J. Fujita, Daiske Honda, Daiske Honda, Hiroaki Ohfuji, Journal of Structural Biology, Journal of Structural Biology, 2018/10, 1047-8477, 10.1016/j.jsb.2018.06.008
  • New High-Pressure Forms of Al<inf>2</inf>SiO<inf>5</inf>, Y. Zhou, T. Irifune, T. Irifune, H. Ohfuji, T. Kuribayashi, Geophysical Research Letters, Geophysical Research Letters, 2018/08, 0094-8276, 10.1029/2018GL078960
  • Neutron diffraction study of the structural and magnetic properties of ε-Fe<inf>3</inf>N<inf>1.098</inf> and ε-Fe<inf>2.322</inf>Co<inf>0.678</inf>N<inf>0.888</inf>, Li Lei, Leilei Zhang, Shangpan Gao, Qiwei Hu, Leiming Fang, Xiping Chen, Yuanhua Xia, Xianlong Wang, Hiroaki Ohfuji, Yohei Kojima, Simon A.T. Redfern, Zhi Zeng, Bo Chen, Duanwei He, Tetsuo Irifune, Journal of Alloys and Compounds, Journal of Alloys and Compounds, 2018/07, 0925-8388, 10.1016/j.jallcom.2018.04.143
  • A step toward better understanding of behavior of organic materials at simultaneous high pressures and high temperatures, N. Chertkova, H. Ohfuji, R. Nomura, H. Kadobayashi, T. Irifune, High Pressure Research, High Pressure Research, 2018/07, 0895-7959, 10.1080/08957959.2018.1476506
  • Synthesis of ultrafine nano-polycrystalline cubic boron nitride by direct transformation under ultrahigh pressure, Yoshio Ichida, Hiroaki Ohfuji, Tetsuo Irifune, Takehiro kunimoto, Yohei Kojima, Toru Shinmei, Journal of the European Ceramic Society, Journal of the European Ceramic Society, 2018/07, 0955-2219, 10.1016/j.jeurceramsoc.2018.02.023
  • New Data on Diamond–Graphite Relationships in the Gneisses of the Kokchetav Massif (Northern Kazakhstan), D. S. Mikhailenko, O. V. Shchepetova, K. A. Musiyachenko, A. V. Korsakov, Hiroaki Ohfuji, I. V. Pekov, Doklady Earth Sciences, Doklady Earth Sciences, 2018/06, 1028-334X, 10.1134/S1028334X18060272
  • Transition in deformation mechanism during high-temperature tensile testing of friction-stir-processed 5083 aluminum alloy, Takashi Mizuguchi, Tsutomu Ito, Tsutomu Ito, Kota Kimura, Kota Kimura, Tokiko Kurisaka, Hiroaki Ohfuji, Zairyo/Journal of the Society of Materials Science, Japan, Zairyo/Journal of the Society of Materials Science, Japan, 2018/05, 0514-5163, 10.2472/jsms.67.568
  • Oxidation states of Fe in constituent minerals of a spinel Lherzolite xenolith from the Tariat depression, Mongolia: The significance of Fe<sup>3+</sup>in olivine, Terumi Ejima, Yasuhito Osanai, Masahide Akasaka, Tatsuro Adachi, Nobuhiko Nakano, Yoshiaki Kon, Hiroaki Ohfuji, Jargalan Sereenen, Minerals, Minerals, 2018/05, 10.3390/min8050204
  • In situ Raman and X-ray diffraction studies on the high pressure and temperature stability of methane hydrate up to 55 GPa, Hirokazu Kadobayashi, Hisako Hirai, Hiroaki Ohfuji, Michika Ohtake, Yoshitaka Yamamoto, Journal of Chemical Physics, Journal of Chemical Physics, 2018/04, 0021-9606, 10.1063/1.5013302
  • Quenchable compressed graphite synthesized from neutron-irradiated highly oriented pyrolytic graphite in high pressure treatment at 1500 °c, Keisuke Niwase, Mititaka Terasawa, Shin Ichi Honda, Masahito Niibe, Tomohiko Hisakuni, Tadao Iwata, Yuji Higo, Takeshi Hirai, Toru Shinmei, Hiroaki Ohfuji, Tetsuo Irifune, Journal of Applied Physics, Journal of Applied Physics, 2018/04, 0021-8979, 10.1063/1.5011209
  • High pressure generation using double-stage diamond anvil technique: problems and equations of state of rhenium, Takeshi Sakai, Takehiko Yagi, Tetsuo Irifune, Tetsuo Irifune, Hirokazu Kadobayashi, Naohisa Hirao, Takehiro Kunimoto, Hiroaki Ohfuji, Saori Kawaguchi-Imada, Yasuo Ohishi, Shigehiko Tateno, Kei Hirose, Kei Hirose, High Pressure Research, High Pressure Research, 2018/04, 0895-7959, 10.1080/08957959.2018.1448082
  • Electronic properties of nano-polycrystalline diamond synthesised by high-pressure and high-temperature technique, Rei Fukuta, Fumitaro Ishikawa, Akihiro Ishikawa, Kohsuke Hamada, Masafumi Matsushita, Hiroaki Ohfuji, Toru Shinmei, Tetsuo Irifune, Diamond and Related Materials, Diamond and Related Materials, 2018/04, 0925-9635, 10.1016/j.diamond.2018.03.007
  • High-Pressure Synthesis of CeOCl Crystals and Investigation of Their Photoluminescence and Compressibility Properties, Leilei Zhang, Ya Cheng, Ya Cheng, Li Lei, Xianlong Wang, Xianlong Wang, Qiwei Hu, Qiming Wang, Hiroaki Ohfuji, Yohei Kojima, Qiang Zhang, Zhi Zeng, Zhi Zeng, Fang Peng, Zili Kou, Duanwei He, Tetsuo Irifune, Crystal Growth and Design, Crystal Growth and Design, 2018/03, 1528-7483, 10.1021/acs.cgd.7b01712
  • Strengthening effects of interstitial nitrogen on rhenium, Lei Qi, Li Lei, Qiwei Hu, Leilei Zhang, Leihao Feng, Meifang Pu, Hiroaki Ohfuji, Tetsuo Irifune, Journal of Applied Physics, Journal of Applied Physics, 2018/02, 0021-8979, 10.1063/1.5010834
  • Nano-polycrystalline diamond synthesized from neutron-irradiated highly oriented pyrolytic graphite (HOPG), Mititaka Terasawa, Shin ichi Honda, Keisuke Niwase, Masahito Niibe, Tomohiko Hisakuni, Tadao Iwata, Yuji Higo, Toru Shinmei, Hiroaki Ohfuji, Tetsuo Irifune, Diamond and Related Materials, Diamond and Related Materials, 2018/02, 0925-9635, 10.1016/j.diamond.2018.01.001
  • Neutron powder diffraction and high-pressure synchrotron x-ray diffraction study of tantalum nitrides, Lei Hao Feng, Qi Wei Hu, Li Lei, Lei Ming Fang, Lei Qi, Lei Lei Zhang, Mei Fang Pu, Zi Li Kou, Fang Peng, Xi Ping Chen, Yuan Hua Xia, Yohei Kojima, Hiroaki Ohfuji, Duan Wei He, Bo Chen, Tetsuo Irifune, Chinese Physics B, Chinese Physics B, 2018/02, 1674-1056, 10.1088/1674-1056/27/2/026201
  • Pressure induced solid-solid reconstructive phase transition in LiGaO<inf>2</inf> dominated by elastic strain, Qiwei Hu, Xiaozhi Yan, Li Lei, Qiming Wang, Leihao Feng, Lei Qi, Leilei Zhang, Fang Peng, Hiroaki Ohfuji, Duanwei He, Physical Review B, Physical Review B, 2018/01, 2469-9950, 10.1103/PhysRevB.97.014106
  • Crystallization and texturing in graphite-diamond transformation, Hiroaki Ohfuji, Japanese Magazine of Mineralogical and Petrological Sciences, Japanese Magazine of Mineralogical and Petrological Sciences, 2018/01, 1345-630X, 10.2465/gkk.180104
  • The Mg-carbonate–Fe interaction: Implication for the fate of subducted carbonates and formation of diamond in the lower mantle, Naira S. Martirosyan, Naira S. Martirosyan, Konstantin, D. Litasov, Konstantin D. Litasov, Sergey S. Lobanov, Alexander F. Goncharov, Anton Shatskiy, Anton Shatskiy, Hiroaki Ohfuji, Vitali Prakapenka, Geoscience Frontiers, Geoscience Frontiers, 2018/01, 1674-9871, 10.1016/j.gsf.2018.10.003
  • 2017/11, 0377-0486, 10.1002/jrs.5167
  • 2017/10, 2169-9313, 10.1002/2017JB014579
  • 2017/10, 1752-0894, 10.1038/NGEO3011
  • 2017/08, 0925-9635, 10.1016/j.diamond.2017.04.020
  • 2017/07, 0012-821X, 10.1016/j.epsl.2017.04.011
  • 2017/06, 1345-6296, 10.2465/jmps.161219
  • 2017/06, 2041-1723, 10.1038/ncomms15735
  • 2017/03, 2045-2322, 10.1038/srep44755
  • 2017/02, 1345-6296, 10.2465/jmps.160719g
  • Transparent polycrystalline nanoceramics consisting of triclinic Al<inf>2</inf>SiO<inf>5</inf>kyanite and Al<inf>2</inf>O<inf>3</inf>corundum, Nico A. Gaida, Nico A. Gaida, Norimasa Nishiyama, Norimasa Nishiyama, Atsunobu Masuno, Atsunobu Masuno, Ulrich Schürmann, Christopher Giehl, Oliver Beermann, Hiroaki Ohfuji, Jozef Bednarcik, Eleonora Kulik, Eleonora Kulik, Astrid Holzheid, Tetsuo Irifune, Tetsuo Irifune, Lorenz Kienle, Journal of the American Ceramic Society, Journal of the American Ceramic Society, 2017/01, 0002-7820, 10.1111/jace.15281
  • High-temperature microstructural evolution and room-temperature mechanical properties of friction-stir-processed 5083 aluminum alloy, Mizuguchi Takashi, Ito Tsutomu, Kimura Kota, Kurisaka Tokiko, Ohfuji Hiroaki, Kimura Masaki, Journal of Japan Institute of Light Metals, Journal of Japan Institute of Light Metals, 2017, 0451-5994, 10.2464/jilm.67.361
  • Stability region of K0.2Na0.8AlSi3O8 hollandite at 22 GPa and 2273 K, Youmo Zhou, Tetsuo Irifune, Hiroaki Ohfuji, Toru Shinmei, Wei Du, PHYSICS AND CHEMISTRY OF MINERALS, PHYSICS AND CHEMISTRY OF MINERALS, 2017/01, 0342-1791, 10.1007/s00269-016-0834-5
  • Synthesis of Al2O3/SiO2 nano-nano composite ceramics under high pressure and its inverse Hall-Petch behavior, Nico A. Gaida, Norimasa Nishiyama, Atsunobu Masuno, Astrid Holzheid, Hiroaki Ohfuji, Ulrich Schuermann, Christin Szillus, Eleonora Kulik, Jozef Bednarcik, Oliver Beermann, Christopher Giehl, Lorenz Kienle, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2017/01, 0002-7820, 10.1111/jace.14551
  • 2017, 1742-6588, 10.1088/1742-6596/950/4/042044
  • 2016/12, 2041-1723, 10.1038/ncomms13753
  • Micro- and nano-inclusions in a superdeep diamond from So Luiz, Brazil, Hiroyuki Kagi, Dmitry A. Zedgenizov, Hiroaki Ohfuji, Hidemi Ishibashi, GEOCHEMISTRY INTERNATIONAL, GEOCHEMISTRY INTERNATIONAL, 2016/10, 0016-7029, 10.1134/S0016702916100062
  • 2016/10, 0016-7029, 10.1134/S0016702916100050
  • High-pressure solid-state metathesis synthesis of ternary iron-based metal nitrides, Shang Pan Gao, Li Lei, Qi Wei Hu, Lei Ming Fang, Xian Long Wang, Hiroaki Ohfuji, Yohei Kojima, Lei Lei Zhang, Li Jie Tan, Zhi Zeng, Fang Peng, Duan Wei He, Tetsuo Irifune, Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics, Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics, 2016/08, 1000-5773, 10.11858/gywlxb.2016.04.001
  • Phase relation of CaSO4 at high pressure and temperature up to 90 GPa and 2300 K, Taku Fujii, Hiroaki Ohfuji, Toru Inoue, Physics and Chemistry of Minerals, Physics and Chemistry of Minerals, 2016/02, 0342-1791, 10.1007/s00269-016-0799-4
  • Preferential dissolution of SiO2 from enstatite to H2 fluid under high pressure and temperature, Ayako Shinozaki, Ayako Shinozaki, Hiroyuki Kagi, Hisako Hirai, Hiroaki Ohfuji, Taku Okada, Satoshi Nakano, Takehiko Yagi, Physics and Chemistry of Minerals, Physics and Chemistry of Minerals, 2015/12, 0342-1791, 10.1007/s00269-015-0792-3
  • 2015/12, 0026-461X, 10.1180/minmag.2015.079.7.08
  • A Complete Solid Solution with Rutile-Type Structure in SiO2-GeO2 System at 12 GPa and 1600 degrees C, Eleonora Kulik, Norimasa Nishiyama, Atsunobu Masuno, Yan Zubavichus, Vadim Murzin, Evgeny Khramov, Akihiro Yamada, Hiroaki Ohfuji, Hans-Christian Wille, Tetsuo Irifune, Tomoo Katsura, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2015/12, 0002-7820, 10.1111/jace.13859
  • A possible new Al-bearing hydrous Mg-silicate (23 angstrom phase) in the deep upper mantle, Nao Cai, Toru Inoue, Kiyoshi Fujino, Hiroaki Ohfuji, Hisayoshi Yurimoto, AMERICAN MINERALOGIST, AMERICAN MINERALOGIST, 2015/10, 0003-004X, 10.2138/am-2015-5148
  • 2015/10, 2045-2322, 10.1038/srep14702
  • 2015/08, 1345-6296, 10.2465/jmps.141126
  • 2015/07, 0043-1397, 10.1002/2014WR016427
  • 2015/04, 1073-5623, 10.1007/s11661-015-2747-1
  • 2015/04, 0366-7022, 10.1246/cl.141062
  • 2015/03, 0034-6748, 10.1063/1.4914844
  • 2015/02, 0957-0233, 10.1088/0957-0233/26/2/025501
  • 2014/11, 1073-5623, 10.1007/s11661-014-2497-5
  • 2014/10, 2045-2322, 10.1038/srep06558
  • 2014/10, 2041-1723, 10.1038/ncomms6091
  • 2014/07, 0003-004X, 10.2138/am.2014.4798
  • 2014/03, 0031-9201, 10.1016/j.pepi.2013.12.008
  • 2014/03, 0267-0836, 10.1179/1743284713Y.0000000353
  • 2014/01, 0921-5093, 10.1016/j.msea.2013.10.098
  • Transparent nanocrystalline bulk alumina obtained at 7.7 GPa and 800 degrees C, Norimasa Nishiyama, Takashi Taniguchi, Hiroaki Ohfuji, Kimiko Yoshida, Fumihiro Wakai, Byung-Nam Kim, Hidehiro Yoshida, Yuji Higo, Astrid Holzheid, Oliver Beermann, Tetsuo Irifune, Yoshio Sakka, Ken-ichi Funakoshi, SCRIPTA MATERIALIA, SCRIPTA MATERIALIA, 2013/09, 1359-6462, 10.1016/j.scriptamat.2013.05.017
  • 2013/09, 0022-2461, 10.1007/s10853-013-7412-8
  • Structure and stability of carbon nitride under high pressure and high temperature up to 125 GPa and 3000 K, Yohei Kojima, Hiroaki Ohfuji, Diamond and Related Materials, Diamond and Related Materials, 2013/08, 0925-9635, 10.1016/j.diamond.2013.07.006
  • 2013/08, 0003-004X, 10.2138/am.2013.4434
  • Formation of diamond powders from melamine under high pressure and high temperature, Lei Ming Fang, Lei Ming Fang, Xi Ping Chen, H. Ohfuji, T. Irifune, Guang Ai Sun, Bo Chen, Shu Ming Peng, Chinese Physics C, Chinese Physics C, 2013/08, 1674-1137, 10.1088/1674-1137/37/8/088002
  • 2013/06, 0038-1098, 10.1016/j.ssc.2013.03.030
  • 2013/04, 0031-9201, 10.1016/j.pepi.2013.01.006
  • 2013/02, 1345-6296, 10.2465/jmps.120621a
  • 2013/01, 0012-821X, 10.1016/j.epsl.2012.11.022
  • 2013/01, 0921-5093, 10.1016/j.msea.2012.10.008
  • 2013, 1687-4110, 10.1155/2013/380165
  • 2013, 1687-4110, 10.1155/2013/201845
  • 2012/12, 1359-6462, 10.1016/j.scriptamat.2012.08.028
  • 2012/12, 1345-6296, 10.2465/jmps.120605
  • 2012/12, 0094-8276, 10.1029/2012GL053915
  • 2012/12, 0094-8276, 10.1029/2012GL054009
  • 2012/11, 1063-4576, 10.3103/S1063457612060081
  • 2012/09, 2169-9313, 10.1029/2012JB009290
  • Polycrystalline gamma-boron: As hard as polycrystalline cubic boron nitride, Jiaqian Qin, Norimasa Nishiyama, Hiroaki Ohfuji, Toru Shinmei, Li Lei, Duanwei He, Tetsuo Irifune, SCRIPTA MATERIALIA, SCRIPTA MATERIALIA, 2012/08, 1359-6462, 10.1016/j.scriptamat.2012.04.032
  • 2012/08, 0003-004X, 10.2138/am.2012.4097
  • 2012/08, 0021-8979, 10.1063/1.4739766
  • 2012/07, 0342-1791, 10.1007/s00269-012-0510-3
  • 2012/07, 0022-3530, 10.1093/petrology/egs023
  • 2012/07, 0021-8979, 10.1063/1.4736407
  • 2012/05, 0921-5093, 10.1016/j.msea.2012.02.073
  • Influence of brazing filler metal diffusion on the mechanical strength of SUS304/Cu/Si 3N 4 Composite, Nobuhiro Settsu, Masafumi Matsushita, Manabu Takahashi, Masaki Tanimoto, Hiroaki Ohfuji, Zairyo/Journal of the Society of Materials Science, Japan, Zairyo/Journal of the Society of Materials Science, Japan, 2012/02, 0514-5163, 10.2472/jsms.61.197
  • Erratum: Volume and structural study of Fe64Mn36 anti-ferromagnetic Invar alloy under high pressure (Journal of Magnetism and Magnetic Materials (2011) 323:6 (838841)), M. Matsushita, S. Nakano, H. Ohfuji, I. Yamada, T. Kikegawa, Journal of Magnetism and Magnetic Materials, Journal of Magnetism and Magnetic Materials, 2012/02, 0304-8853, 10.1016/j.jmmm.2011.08.041
  • Phase relations in boron at pressures up to 18 GPa and temperatures up to 2200 °c, Jiaqian Qin, Tetsuo Irifune, Haruhiko Dekura, Hiroaki Ohfuji, Norimasa Nishiyama, Li Lei, Toru Shinmei, Physical Review B - Condensed Matter and Materials Physics, Physical Review B - Condensed Matter and Materials Physics, 2012/01, 1098-0121, 10.1103/PhysRevB.85.014107
  • Self-organization process of framboidal pyrite investigated by microtextural analysis, OFUJI HIROAKI, 岩石鉱物科学, 岩石鉱物科学, 2012, 1345-630X, 10.2465/gkk.111207
  • 2011/12, 0883-2927, 10.1016/j.apgeochem.2011.07.005
  • 2011/10, 1345-6296, 10.2465/jmps.110125
  • 2011/10, 0935-1221, 10.1127/0935-1221/2011/0023-2150
  • 2011/09, 0342-1791, 10.1007/s00269-011-0435-2
  • 2011/05, 0925-9635, 10.1016/j.diamond.2011.03.034
  • 2011/04, 0031-9201, 10.1016/j.pepi.2011.02.001
  • 2011/03, 0304-8853, 10.1016/j.jmmm.2010.11.029
  • 2010/10, 1674-487X, 10.1007/s12583-010-0112-2
  • 2010/10, 0021-8979, 10.1063/1.3487976
  • EBSD Analysis of Re-Crystallization Process for Cold Rolled Cu Sheet, MATSUSHITA MASAFUMI, NISHIMURA YUSUKE, OFUJI HIROAKI, 銅と銅合金, 銅と銅合金, 2010/08, 1347-7234
  • 2010/08, 0020-1669, 10.1021/ic100474x
  • 2010/07, 0925-9635, 10.1016/j.diamond.2010.02.015
  • 2010, 1012-0386, 10.4028/www.scientific.net/DDF.297-301.359
  • 2010, 1742-6588, 10.1088/1742-6596/215/1/012192
  • 2010, 0895-7959, 10.1080/08957951003600764
  • 2009/10, 1345-6296, 10.2465/jmps.090622i
  • 2009/09, 0947-8396, 10.1007/s00339-009-5326-8
  • 2009/06, 0009-8558, 10.1180/claymin.2009.044.2.177
  • 2009/05, 0925-9635, 10.1016/j.diamond.2008.10.066
  • 2009/04, 0254-0584, 10.1016/j.matchemphys.2008.11.051
  • 2008/12, 1345-6296, 10.2465/jmps.080828
  • Initiation strength properties of ring crack caused by sphere indentation in damage-tolerant Advanced Pore-Free SiC, Shinya Matsuda, Manabu Takahashi, Masafumi Matsushita, Nagatoshi Okabe, Hiroaki Ohfuji, Zairyo/Journal of the Society of Materials Science, Japan, Zairyo/Journal of the Society of Materials Science, Japan, 2008/11, 0514-5163, 10.2472/jsms.57.1138
  • 2008/08, 0387-5008, 10.1299/kikaia.74.1156
  • 2008/04, 1345-6296, 10.2465/jmps.071022c
  • 2008/02, 0028-0836, 10.1038/nature06551
  • 2008/02, 0003-004X, 10.2138/am.2008.2762
  • Study of the origin of fracture of advanced pore-free silicon carbide with damage tolerance, Shinya MATSUDA, Masafumi MATSUSHITA, Manabu TAKAHASHI, Hiroaki OHFUJI, Nagatoshi OKABE, Journal of the Ceramic Society of Japan, Journal of the Ceramic Society of Japan, 2008, 1882-0743, 10.2109/jcersj2.116.126
  • 2008/01, 1882-0743, 10.2109/jcersj2.116.126
  • 2008, 1345-6296
  • 2008, 0895-7959, 10.1080/08957950802251357
  • 2007/07, 0094-8276, 10.1029/2007GL030312
  • 2007/07, 0342-1791, 10.1007/s00269-007-0151-0
  • 2007/05, 0094-8276, 10.1029/2006GL028823
  • 2007/03, 0008-6223, 10.1016/j.carbon.2006.10.005
  • 2006/12, 0012-821X, 10.1016/j.epsl.2006.10.004
  • 2006/12, 0009-8558, 10.1180/0009855064140221
  • 2006/06, 0895-7959, 10.1080/08957950600765863
  • 2006/01, 0935-1221, 10.1127/0935-1221/2006/0018-0093
  • 2006/01, 0012-821X, 10.1016/j.epsl.2005.10.006
  • 2005/11, 0003-004X, 10.2138/am.2005.1829
  • 2005/08, 0012-8252, 10.1016/j.earscirev.2005.02.001
  • 2005, 10.15080/agcjchikyukagaku.59.2_103
  • 2004/02, 0883-2927, 10.1016/j.apgeochem.2003.09.008
  • 2002/01, 0003-004X

Other Research Activities

Patents

  • 特願2014-530476, 特許第6045000号
  • 特願2013-168004, 特開2014-055099
  • JP2013052768, WO2014-027470

Awards & Honors

Research Grants & Projects

  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(B)), Verification of ultra-low strain rate effect on olivine rheology, Jun-ichi ANDO, Takehiko HIRAGA, Tomoaki MORISHITA, Hiroaki OHFUJI, In this research, we observed the microstructures of both alpine-type peridotites and peridotite xenoliths in basalt, and analyzed the microchemistry around the dislocations developed in the olivine grains of the studied samples, using optical microscopy, EPMA, EBSD, TEM and ATEM techniques to clarify if the ultra-low strain rate has any effect on the olivine plasticity. We detected Fe-concentration along dislocation line in all observed samples, which was probably caused by Cottrell atmosphere. This result strongly suggests that the effect of ultra-low strain rate on olivine plasticity is very important to understand the dynamics of the upper mantle, which has not been studied so far. In addition, we tried to do the deformation experiments of olivine to support the above conclusion, which has yet to produce any confirming results.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(若手研究(B)), Synthesis of pure sintered body of hexagonal diamond and its characterization, Hiroaki OHFUJI, We performed a series of high pressure and high temperature experiments using a large-volume press to synthesize a pure, single-phase hexagonal diamond sintered body. Our study demonstrated that single-phase hexagonal diamond, which includes neither traces of unreacted graphite starting material nor cubic diamond, can be obtained at 25 GPa and 1100-1500C through direct conversion of highly-oriented, highly-crystalline graphite. The sample consists of extremely thin layered units (a few to several tens of nm) and is as dense as cubic diamond. Since our preliminary hardness measurements provided very high indentation hardness values comparable to or exceeding that of cubic diamond, this nano-sintered body of pure hexagonal diamond would have potential application as a novel ultra-hard material.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(挑戦的萌芽研究), Dislocation structure around fluid inclusions in olivine and orthopyroxene, Junji YAMAMOTO, Hiroyuki KAGI, Hiroaki OHFUJI, Hidemi ISHIBASHI, Dislocations provide a direct proof of plastic deformation of minerals. We observed dislocation structure around fluid inclusions in olivine and orthopyroxene. For olivine, development of edge dislocations with loop shape whose size is analogous to that of an adjacent fluid inclusion indicate that the dislocations result from excess pressure of the fluid inclusion. The generation of loop dislocations would be controlled by yield strength of slip systems of olivine. For orthopyroxene, a few screw dislocations are identified in c-axis. The difference in dislocation density between both minerals suggests the higher yield strength of orthopyroxene. This is verified by the fact that expansion of a fluid inclusion in olivine estimated by dislocation structure can well explain difference in CO2 fluid density between the minerals. The observation of dislocation structure around fluid inclusions in xenoliths is useful to assess relative strength of slip systems among minerals.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(A)), The behavior and distribution of water and carbon dioxide in the Earth's interior, Toru INOUE, Norimasa NISHIYAMA, Hiroaki OHFUJI, 河野 義生, Kyoko MATSUKAGE, Akihiro YAMADA, 安東 淳一, Yoshio KONO, Yuji HIGO, Distribution of water in the Earth’s interiors and the effect of water for phase transition boundaries were clarified, and the water content in the Earth’s interior s was estimated by combining with the seismic data. Moreover, the studies for the dehydration reaction and the equation of state of the slab constituent minerals, and also the study for the effect of water to the mantle mineralogy were carried out. In addition, the study of the compositional dependence for the water content in mantle minerals was carried out. We also tried to determine the water content of magma as a function of pressure and temperature.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(特別推進研究), Behavior ofFe-bearing materials under very high pressure and mineralogy of the lowermost mantle and the inner core, Tetsuo IRIFUNE, 肥後 祐司, 臼井 祐介, Taku TSUCHIYA, Hiroaki OHFUJI, Norimasa NISHIYAMA, Yoshinori TANGE, Yasuhiro KUWAYAMA, Yuji HIGO, Yusuke USUI, Takahiro ISHIKAWA, Yusuke USUI, L Whitaker MATTHEW, Yu NISHIHARA, Takehiro KUNIMOTO, Behaviors of iron and iron-bearing minerals have been studiedby both multianvil and diamond anvil cell experiments, in conjunction with ab initio calculations, under the pressure and temperature conditions from the deep lower mantle to the inner core of the Earth. A number of important results such as relevant to the partitioning of iron in the lower mantle and the phase relations of iron in the inner core, as well as technological developments in applying nano-polycrystalline diamond (NPD or HIME-diamond) to various high-pressure apparatus, have been obtained in this study.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(学術創成研究費), Material sciences at ultra-high pressure using the strongest spallation neutron source, Hiroyuki KAGI, 山室 修, 上床 美也, 奥地 拓生, 近藤 忠, 佐々木 重雄, 平井 寿子, 長壁 豊隆, Takuo OKUCHI, Hisako HIRAI, Tadashi KONDO, Toyotaka OSAKABE, Shigeo SASAKI, Osamu YAMAMURO, Yoshiya UWATOKO, Hiroshi ARIMA, Kazuki KOMATSU, Hiroaki OHFUJI, This research project aimed at developing neutron diffraction measurements at high pressure using a intense spallation neutron source at J-PARC and clarifying crystal structures of hydrogen-bearing materials in the deep earth, interior of planets, and so on. We have developed novel neutron-focusing device for small samples under high pressure, new high-pressure instruments optimized for the intense neutron source. We have opened a new horizon for sciences on earth and planetary materials at high pressure.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(若手研究(B)), High pressure and temperature generation using nano-polycrystalline diamond for diamond anvil cell-Application for melting experiments of pure iron-, Hiroaki OHFUJI, Laser heating in diamond anvil cell (DAC) equipped with nano-polycrystalline diamond (NPD) anvils was tested for the first time using various types of lasers. NPD-based DAC was found to provide better heating efficiency than a standard DAC with single-crystal anvils. We observed high-temperature generation exceeding 5000 K and 3500 K during laser heating of hcp-Fe sample at pressures of ~100 and 170 GPa, respectively.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(B)), Two-phase rheology of earth's lower mantle, Daisuke YAMAZAKI, Eiji ITO, Tomoo KATURA, Hiroaki OFUJI, Takashi YOSHINO
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(特定領域研究), Modeling of slab penetration and stagnation processes, 入舩 徹男, Norimasa NISHIYAMA, Toru INOUE, Daisuke YAMAZAKI, Junichi ANDO, Tomoo KATSURA, Kenichi FUNAKOSHI, Hiroaki OHFUJI
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(学術創成研究費), Searching mineralogy of the Earth's deep interior using a combination of synchrotron radiation and high-pressure technology, Tetsuo IRIFUNE, 西山 宣正, 阪本 志津枝, 山崎 大輔, 趙 大鵬, Toru INOUE, Taku TSUCHIYA, Hiroaki OHFUJI, Yuji HIGO, Akira YAMADA, Technical developments have been made in producing higher pressures in multianvil apparatus using sintered diamond (SD) anvils and also for precise measurements of sound velocities of high-pressure phases under the P/T conditions of the mantle transition region. We succeeded to produce pressures as high as〜80 GPa at room temperature using SD anvils, while pressures have been limited to〜60 GPa at the high temperatures relevant to the Earth's mantle. Some new phase transitions have been found in mantle minerals under the conditions of the lower mantle, and precise determination of the P-V-T relations of these and other high-pressure phases have been conducted under the corresponding P, T conditions. On the other hand, precise measurements of sound velocities have been made at pressures to〜20GPa and temperatures to〜1700K, equivalent to those of the depths of the middle part of the mantle transition region. Using this technique; measurements on ringwoodite and majorite in a pyrolite composition, polycrystalline MgO, and the garnetite (majorite + stishovite) in a basaltic composition have been made, which provided important data sets to constrain the mineralogy of the mantle transition region and to provide a new self-consistent pressure scale. In addition to these studies, we have tested the performance of the newly produced nano-polycrystalline diamond (HIME-DIA) for high-pressure devices, and found the great potential of this novel material for anvils for both multianvil apparatus and diamond anvil cell, which yielded the highest pressures of〜110 Gpa and〜20 Gpa, respectively.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(B)), Physical properties of deep Earth minerals and the effect of water, Toru INOUE, 肥後 祐司, Daisuke YAMAZAKI, Tetsuo IRIFUNE, Jun-ichi ANDO, Yuji HIGO, Hiroaki OHFUJI, We have clarified the physical properties of deep Earth mantle minerals and the effect of water. Experiments were conducted by in situ X-ray measurements in addition to quench experiments.From our previous studies, it has been clarified that high pressure polymorphs of olivine, wadsleyite and ringwoodite, can contain 2-3 wt% of H_2O in their crystal structures, but the partitioning of H_2O among these minerals has not been clarified yet. In the present study, we have clarified the partitioning of H_2O to synthesize these coexisting phases, and found that mantle transition zone should be a strong water reservoir in the Earth's interior.In addition, the measurements of thermal expansion and elastic properties of hydrous wadsleyite and hydrous ringwoodite were conducted to clarify the H_2O content in the mantle. Combined these results with seismic observation, we estimated the H_2O content in the mantle. Further extensive studies have been conducted with seismologist.We also tried to observe dehydration and physical properties of high pressure hydrous phase with capsulation using relatively light metal capsule by in situ X-ray observation. We succeeded to get X-ray spectra of superhydrous phase B using AgPd capsule, and further improved capsule, which were made by a single crystal diamond sleeve and metal caps, were designed for in situ X-ray experiment. The capsule is quite successful, and the effective acquisition of X-ray spectra under high pressure has been achieved by in situ X-ray experiment. This technique has been adopted to determine hydrous melt structure and time-resolved experiment of dehydration.

Activity track record

Educational activities

Course in charge

  • 2019, the first semester, under graduate, 地学英語
  • 2019, the first semester, under graduate, 地球科学野外実習Ⅰ
  • 2019, the first semester, under graduate, 地質調査法実習
  • 2019, the first semester, under graduate, 地球科学実験Ⅰ
  • 2019, the first semester, master course, 鉱物学特論
  • 2019, the first semester, master course, 地球科学高等実験Ⅰ
  • 2019, the first semester, master course, 地球科学高等実験Ⅱ
  • 2019, the first semester, master course, 地球科学高等実験Ⅴ
  • 2019, the first semester, master course, 地球科学高等実験Ⅵ
  • 2019, the first semester, master course, 地球科学プレゼンテーション特別実習Ⅰ
  • 2019, the first semester, master course, 地球科学プレゼンテーション特別実習Ⅲ
  • 2019, the first semester, master course, 地球科学ゼミナールⅠ
  • 2019, the first semester, master course, 地球科学ゼミナールⅢ
  • 2019, the first semester, master course, 地球科学プレゼンテーション特別実習Ⅱ
  • 2019, the first semester, master course, 地球科学高等実験Ⅲ
  • 2019, the first semester, under graduate, 地球科学野外実習I
  • 2019, the first semester, under graduate, 地質調査法実習
  • 2019, the first semester, under graduate, 地球科学実験I


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