Y
Yasuo Ohishi
Researcher at National Institute for Materials Science
Publications - 255
Citations - 9818
Yasuo Ohishi is an academic researcher from National Institute for Materials Science. The author has contributed to research in topics: Diamond anvil cell & Phase (matter). The author has an hindex of 51, co-authored 255 publications receiving 8706 citations. Previous affiliations of Yasuo Ohishi include Japan Agency for Marine-Earth Science and Technology & Tokyo Institute of Technology.
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Post-Perovskite Phase Transition in MgSiO3
TL;DR: Results demonstrate that MgSiO3 perovskite transforms to a new high-pressure form with stacked SiO6-octahedral sheet structure above 125 gigapascals and 2500 kelvin (2700-kilometer depth near the base of the mantle) with an increase in density of 1.0 to 1.2%.
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Stability of magnesite and its high-pressure form in the lowermost mantle
Maiko Isshiki,Tetsuo Irifune,Kei Hirose,Shigeaki Ono,Yasuo Ohishi,Tetsu Watanuki,Eiji Nishibori,Masaki Takata,Makoto Sakata +8 more
TL;DR: It is found that magnesite transforms to an unknown form at pressures above ∼115 GPa and temperatures of 2,100–2,200 K (depths of ∼2,600 km) without any dissociation, suggesting that Magnesite and its high-pressure form may be the major hosts for carbon throughout most parts of the Earth's lower mantle.
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Structural studies of disordered materials using high-energy x-ray diffraction from ambient to extreme conditions
Shinji Kohara,Masayoshi Itou,Kentaro Suzuya,Yasuhiro Inamura,Yoshiharu Sakurai,Yasuo Ohishi,Masaki Takata +6 more
TL;DR: In this article, high-energy x-ray diffraction beamlines and a dedicated diffractometer for glass, liquid and amorphous materials at SPring-8 were introduced.
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The Disorder-Free Non-BCS Superconductor Cs3C60 Emerges from an Antiferromagnetic Insulator Parent State
Yasuhiro Takabayashi,Alexey Y. Ganin,Peter Jeglič,Denis Arčon,Denis Arčon,T. Takano,Yoshihiro Iwasa,Yasuo Ohishi,Masaki Takata,Nao Takeshita,Kosmas Prassides,Matthew J. Rosseinsky +11 more
TL;DR: In Cs3C60, where the molecular valences are precisely assigned, the superconducting state at 38 kelvin emerges directly from a localized electron antiferromagnetic insulating state with the application of pressure, with a dependence of the transition temperature on pressure-induced changes of anion packing density that is not explicable by Bardeen-Cooper-Schrieffer (BCS) theory.
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Post‐perovskite phase transition and mineral chemistry in the pyrolitic lowermost mantle
TL;DR: In this paper, phase relations of a natural mantle composition were determined up to 126 GPa and 2450 K by in-situ x-ray diffraction measurements in a laser-heated diamond-anvil cell (LHDAC).