High pressure powder X-ray diffraction study of Cr2As and pressure-induced structural phase transition

被引：9

作者：

Yu, Z. H. ^{[1
,2
]}

Li, C. Y. ^{[1
,3
]}

Liu, H. Z. ^{[4
]}

机构：

[1] Harbin Inst Technol, Ctr Condensed Matter Sci & Technol, Dept Phys, Harbin 150080, Peoples R China

[2] Argonne Natl Lab, Adv Photon Source, XSD, Argonne, IL 60439 USA

[3] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA

[4] Harbin Inst Technol, Nat Sci Res Ctr, Harbin 150080, Peoples R China

来源：

SOLID STATE COMMUNICATIONS | 2012年 / 152卷 / 06期

关键词：

Magnetically ordered materials; Crystal structure and symmetry; Phase transitions; High pressure; CRYSTAL-STRUCTURE; FE2P-TYPE;

D O I：

10.1016/j.ssc.2011.12.041

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Cr2As, which is an intermetallic compound of Cu2Sb-type with Strukturbericht designation C38 was studied under a pressure of up to 32.5 GPa at room temperature using in situ synchrotron X-ray powder diffraction with a diamond anvil cell. From the X-ray diffraction analysis, our results showed that the Cu2Sb (C38)-type phase of Cr2As undergoes a pressure-induced structural phase transition near 15.4 GPa. The high-pressure (HP) phase of Cr2As is suggested as an orthorhombic structure. No additional structural phase transition was observed up to 32.5 GPa, and the initial low-pressure (LP) Cu2Sb (C38)-type structure was recovered as the pressure was released, implying that the observed pressure-induced structural phase transformation was reversible. The pressure-volume data of Cr2As was fitted to a second-order Birch-Murnaghan equation of state, which yielded a bulk modulus of B-0 = 125(3) and 340 (12) GPa for the LP and the HP phases, respectively. Furthermore, the a axis is more compressible than the c axis for the LP phase of Cr2As. The anisotropic compressibility of the studied crystal is discussed in terms of the crystallography stacking. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：509 / 512

页数：4

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