Pressure-induced phase transition of B-type Y2O3

被引：9
|
作者：
Zhang, Qian [1 ]
Wu, Xiang [2 ]
Qin, Shan [3 ,4 ]
机构：
[1] China Univ Geosci, Gemol Inst, Wuhan 430074, Peoples R China
[2] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
[3] Peking Univ, Minist Educ, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
[4] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
来源：
CHINESE PHYSICS B | 2017年 / 26卷 / 09期
基金：
美国国家科学基金会;
关键词：
Y2O3; x-ray diffraction; pressure-induced phase transition; equation of state; RARE-EARTH SESQUIOXIDES; AB-INITIO; DIFFRACTION; OXIDES;
D O I：
10.1088/1674-1056/26/9/090703
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The synthesized monoclinic (B-type) phase of Y2O3 has been investigated by in situ angle-dispersive x-ray diffraction in a diamond anvil cell up to 44 GPa at room temperature. A phase transition occurs from monoclinic (B-type) to hexagonal (A-type) phase at 23.5 GPa and these two phases coexist even at the highest pressure. Parameters of isothermal equation of state are V-0 = 69.0 (1) angstrom(3), K-0 = 159 (3) GPa, K'(0) = 4 (fixed) for the B-type phase and V-0 = 67.8(2) angstrom(3), K-0 = 156 (3) GPa, K'(0) = 4 (fixed) for the A-type phase. The structural anisotropy increases with increasing pressure for both phases.
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页数：5
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