Pressure-induced phase transitions of lanthanide monoarsenides LaAs and LuAs with a NaCl-type structure

被引：65
作者：
Shirotani, I
Yamanashi, K
Hayashi, J
Ishimatsu, N
Shimomura, O
Kikegawa, T
机构：
[1] Muroran Inst Technol, Fac Engn, Muroran, Hokkaido 0508585, Japan
[2] SPring 8, Hyogo 6795198, Japan
[3] KEK, IMSS, Tsukuba, Ibaraki 3050801, Japan
来源：
SOLID STATE COMMUNICATIONS | 2003年 / 127卷 / 08期
关键词：
chemical synthesis; crystal structure and symmetry; phase transitions; strain; high pressure; synchrotron radiation;
D O I：
10.1016/S0038-1098(03)00491-5
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
By use of synchrotron radiation the powder X-ray diffraction of lanthanide monoarsenides LaAs and LuAs with a NaCl-type structure has been studied up to 60 GPa at room temperature. First-order phase transitions with the crystallographic change were found at around 20 GPa for LaAs, and 57 GPa for LuAs. The high-pressure form of LaAs is a tetragonal structure and can be viewed as a distorted CsCl-type structure. The atoms in the tetragonal structure are located at La: 0, 0, 0; As: 1/2, 1/2, 1/2. The space group is P4/mmm. The structural change to the tetragonal structure occurs with the volume collapse of about 10%. The structure of these high-pressure phases of LuAs is unknown. The volume vs. pressure curves for LaAs and LuAs are fitted by a Birch equation of state. The bulk moduli of both arsenides are 92 +/- 6 GPa for LaAs and 85 +/- 3 GPa for LuAs. The high-pressure structural behavior of LaX (X = P, As and Sb) and LnAs (Ln = lanthanide) with the NaCl-type structure is discussed. (C) 2003 Elsevier Ltd. All rights reserved.
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页码：573 / 576
页数：4
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