High-Pressure Phase Transitions of Cubic Y$_{2}$O$_{3}$ under High Pressures by In-situ Synchrotron X-Ray Diffraction
Sheng Jiang1,2** , Jing Liu3 , Xiao-Dong Li3 , Yan-Chun Li3 , Shang-Ming He1,2 , Ji-Chao Zhang1,2
1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 2012032 Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 2012103 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
Abstract ：High-pressure phase transitions of cubic Y$_{2}$O$_{3}$ are investigated using in situ synchrotron x-ray diffraction in a diamond anvil cell up to 36.3 GPa. The pressure-induced phase transitions of cubic Y$_{2}$O$_{3}$, which display apparent inconsistencies in previous studies, are verified to be from a cubic phase to a monoclinic phase and further to a hexagonal phase at 11.7 and 21.6 GPa, respectively. The hexagonal Y$_{2}$O$_{3}$ displays noticeable anisotropic compressibility due to its layered structure and it is stable up to the highest pressure in the present study. A third-order Birch–Murnaghan fit based on the observed pressure-volume data yields zero pressure bulk moduli of 180(3), 196(7) and 177(7) GPa for cubic, monoclinic and hexagonal phases, respectively.
收稿日期: 2018-12-06
出版日期: 2019-03-23
:
61.50.-f
(Structure of bulk crystals)
61.50.Ks
(Crystallographic aspects of phase transformations; pressure effects)
62.50.-p
(High-pressure effects in solids and liquids)
61.05.cp
(X-ray diffraction)
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2019, Vol. 36 
