High-pressure structural transformations of PbCrO4 up to 51.2 GPa: An angle-dispersive synchrotron X-ray diffraction study

被引：11

作者：

Errandonea, D. ^{[1
]}

Kumar, R. S. ^{[2
]}

机构：

[1] Univ Valencia, MALTA Consolider Team, Dept Fis Aplicada ICMUV, E-46100 Valencia, Spain

[2] Univ Nevada, Dept Phys & Astron, High Pressure Sci & Engn Ctr, Las Vegas, NV 89154 USA

来源：

MATERIALS RESEARCH BULLETIN | 2014年 / 60卷

关键词：

Ceramics; Phase transition; High-pressure; X-ray diffraction; Crystal structure; CRYSTAL-STRUCTURES; MONAZITE; ZIRCON;

D O I：

10.1016/j.materresbull.2014.08.041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on high-pressure X-ray diffraction measurements up to 51.2 GPa in PbCrO4 at room temperature. Three high-pressure phases with structures different than the ambient-pressure monazite-type (P2(1)/n) are reported. One phase transition was found at 3.8 GPa to an isomorphic structure to monazite. A second transition occurs at 11.1 GPa. After this transition, the coexistence of tetragonal (I4(1)/a) and monoclinic (P2(1)) structures is detected up to 21.1 GPa. Beyond this pressure and up to 51.2 GPa, only the high-pressure monoclinic phase is observed. Upon decompression all structural changes are reversible. Finally, the axial compressibilities for the different phases have been determined as well as the equations of state. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：206 / 211

页数：6

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