AMERICAN MINERALOGIST 102(10) 2032-2044 2017年10月 [査読有り]
High-pressure high-temperature phase relation experiments in Mg14Si5O24 were performed using a 6-8 multi-anvil high-pressure apparatus in the pressure range of 12-22 GPa and temperature range of 1673-2173 K. We first found that Mg14Si5O24 anhydrou...
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 86(6) 2017年6月 [査読有り]
Using microbeam hard X-ray photoelectron spectroscopy, we clarified the valence-band electronic structures and chemical states of platinum-group metal (Ru, Ir, and Pt) pernitrides, which have been synthesized in supercritical nitrogen fluid under ...
M. Akaogi   K. Abe   H. Yusa   T. Ishii   T. Tajima   H. Kojitani   D. Mori   Y. Inaguma   
PHYSICS AND CHEMISTRY OF MINERALS 44(1) 63-73 2017年1月 [査読有り]
Phase relations in FeTiO3 were precisely determined at 25-35 GPa and 600-1600 A degrees C using multianvil high-pressure experiments with tungsten carbide anvils. Pressure generation up to about 36 GPa at 1600 A degrees C was evaluated using Al2O3...
The crystal structure of the high-pressure Mg2Cr2O5 phase was studied by single-crystal X-ray diffraction (XRD) analysis for the recovered samples. The 61 parameters including anisotropic displacement parameters of each atom and site occupancies o...
We determined phase relations in FeCr2O4 at 12-28 GPa and 800-1600 degrees C using a multi-anvil apparatus. At 12-16 GPa, FeCr2O4 spinel (chromite) first dissociates into two phases: a new Fe2Cr2O5 phase + Cr2O3 with the corundum structure. At 17-...
PHYSICS OF THE EARTH AND PLANETARY INTERIORS 228 160-169 2014年3月
Phase transitions in NaZnF3 and NaMnF3 were examined up to 24 GPa and 1100 degrees C using a multianvil apparatus. NaZnE3 perovskite transforms to postperovskite above 11-16 GPa at 600-1000 degrees C, and the postperovskite is quenchable at ambien...
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 136(7) 2748-2756 2014年2月
A polar LiNbO3-type (LN-type) titanate ZnTiO3 has been successfully synthesized using ilmenite-type (IL-type) ZnTiO3 under high pressure and high temperature. The first principles calculation indicates that LN-type ZnTiO3 is a metastable phase obt...