Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Hiroaki Ohfuji"'
Publikováno v:
Doklady Earth Sciences. 497:227-231
An inclusion of graphite in zircon from the diamond- and tourmaline-bearing rocks of the Kokchetav massif (Northern Kazakhstan) has been studied. The inclusion, associated with diamond crystals, was identified within the marginal part of the zircon g
Autor:
Hideaki Kawamura, Yoshitaka Yamamoto, Hiroaki Ohfuji, Hirokazu Kadobayashi, Hisako Hirai, Michihiro Muraoka, Suguru Yoshida
Publikováno v:
The Journal of Physical Chemistry A. 124:10890-10896
High-pressure experiments were conducted to investigate the stability and phase transition of methane hydrate (MH) in the water-methane-ammonia system at room-to-high temperatures employing Raman spectroscopy and synchrotron X-ray powder diffraction,
Autor:
Yoshitaka Yamamoto, Hiroaki Ohfuji, Hisako Hirai, Keita Suzuki, Suguru Yoshida, Hirokazu Kadobayashi, Michihiro Muraoka
Publikováno v:
Journal of Raman Spectroscopy. 51:2536-2542
Autor:
Tomohiko Hisakuni, Keisuke Niwase, Toru Shinmei, Shin-ichi Honda, Yuji Higo, Tetsuo Irifune, Tadao Iwata, Mititaka Terasawa, Masahito Niibe, Hiroaki Ohfuji
Publikováno v:
Diamond and Related Materials. 82:132-136
Highly oriented pyrolytic graphite (HOPG) is a unique source material for the synthesis of new types of diamond. It can transform to layered nano-polycrystalline diamond (NPD) under static high pressure and high temperature (HPHT) and to “amorphous
Autor:
Jargalan Sereenen, Terumi Ejima, Yasuhito Osanai, Yoshiaki Kon, Nobuhiko Nakano, Hiroaki Ohfuji, Masahide Akasaka, Tatsuro Adachi
Publikováno v:
Minerals; Volume 8; Issue 5; Pages: 204
Minerals, Vol 8, Iss 5, p 204 (2018)
Minerals, Vol 8, Iss 5, p 204 (2018)
The oxidation states of Fe within olivine, orthopyroxene, clinopyroxene, and spinel in a spinel lherzolite xenolith from the Tariat Depression, Mongolia were investigated using 57Fe Mössbauer spectroscopy to evaluate the redox condition of the upper
Autor:
Hiroaki Ohfuji, Leilei Zhang, Xiaozhi Yan, Li Lei, Fang Peng, Leihao Feng, Duanwei He, Qiming Wang, Qiwei Hu, Lei Qi
Publikováno v:
Physical Review B. 97
Pressure induced solid-solid reconstructive phase transitions for graphite-diamond, and wurtzite-rocksalt in GaN and AlN occur at significantly higher pressure than expected from equilibrium coexistence and their transition paths are always inconsist
Autor:
Hisako Hirai, Satoshi Nakano, Takehiko Yagi, Hiroyuki Kagi, Taku Okada, Hiroaki Ohfuji, Naoki Noguchi, Ayako Shinozaki
Publikováno v:
American Mineralogist. 99:1265-1269
Species dissolved in H 2 fluid were investigated in a SiO 2 –H 2 system. Raman and infrared (IR) spectra were measured at high pressure and room temperature after heating experiments were conducted at two pressure and temperature conditions: 2.0 GP
Publikováno v:
American Mineralogist. 98:1604-1609
High-pressure and high-temperature experiments were carried out in a Mg2SiO4-H2 system using laser-heated diamond-anvil cells to understand the influence of H2 fluid on the stability of forsterite. In situ X-ray diffraction experiments and Raman spec
Publikováno v:
Solid State Communications. 164:6-10
The high-pressure phase transitions and Raman phonon behaviors of LiGaO 2 were investigated by high-pressure Raman spectroscopy and first-principle calculations. The β -LiGaO 2 was evidenced to undergo irreversible phase transitions to Raman silent
Publikováno v:
The Journal of Chemical Physics. 148:164503
High-temperature and high-pressure experiments were performed under 2-55 GPa and 298-653 K using in situ Raman spectroscopy and X-ray diffraction combined with externally heated diamond anvil cells to investigate the stability of methane hydrate. Pri