High-temperature structural evolution of caesium and rubidium triiodoplumbates

被引：507

作者：

Trots, D. M. ^{[1
]}

Myagkota, S. V. ^{[2
,3
]}

机构：

[1] DESY, HASYLAB, D-22607 Hamburg, Germany

[2] Ivan Franko Natl Univ Lviv, Dept Phys, UA-79005 Lvov, Ukraine

[3] Lviv State Agr Univ, UA-80381 Dublyany Lviv, Ukraine

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2008年 / 69卷 / 10期

关键词：

X-ray diffraction; Crystal structure; Phase transitions; Thermal expansion;

D O I：

10.1016/j.jpcs.2008.05.007

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

CsPbl(3) and RbPbl(3) were investigated by in situ powder diffraction within temperature ranges of 298-687K and 298-714K, respectively. Both compounds crystallize in orthorhombic Pnma symmetry and expand isotropically upon a heating, revealing almost the same relative change of the lattice parameters. A pronounced difference in the structural evolution close to 600K was observed namely, CsPbl(3) undergoes first-order reversible phase transformation Pnma <->(563K) Pnma+Pm (3) over barm <->(602K) Pm (3) over barm, whereas no transitions (except of the sample's melting) in RbPbl(3) were detected. An attempt to clarify the relation between the existence/absence of a phase transition and bulging out of the iodine environment around alkaline ions was undertaken. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2520 / 2526

页数：7

共 18 条

[1] SYNTHESIS, CRYSTAL-STRUCTURE, AND ELECTRONIC-STRUCTURE OF INCDBR3 [J].