High-temperature structural evolution of caesium and rubidium triiodoplumbates

被引：502
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.
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收藏
页码：2520 / 2526
页数：7
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