High-Pressure Phase Transitions of Cubic Y2O3 under High Pressures by In-situ Synchrotron X-Ray Diffraction

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2019,（4）
• 页码范围: 62-66
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/0256-307X/36/4/046103

摘要

High-pressure phase transitions of cubic Y2O3 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 Y2O3,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 21.6GPa,respectively.The hexagonal Y2O3 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.