Theory of order-disorder phase transitions of B-cations in AB′1/2B''1/2O3 perovskites

被引:20
|
作者
Sakhnenko, V. P. [1 ]
Ter-Oganessian, N. V. [1 ]
机构
[1] Southern Fed Univ, Inst Phys, Rostov Na Donu 344090, Russia
基金
俄罗斯基础研究基金会;
关键词
order-disorder phase transitions; phase transitions; AB'B-1/2''O-1/2(3) perovskites; B-cations; lattice constants; NEUTRON POWDER DIFFRACTION; HIGH-PRESSURE SYNTHESIS; CRYSTAL-STRUCTURE; X-RAY; MAGNETIC-PROPERTIES; DIELECTRIC-PROPERTIES; PB(B-1/2B-1/2)O-3-TYPE PEROVSKITES; SOLID-SOLUTIONS; SR; RELAXOR;
D O I
10.1107/S205252061800392X
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Perovskite-like oxides AB'B-1/2''O-1/2(3) with two different cations in the B-sublattice may experience cation order-disorder phase transitions. In many cases the degree of cation ordering can be varied by suitable synthesis conditions or subsequent sample treatment, which has a fundamental impact on the physical properties of such compounds. Therefore, understanding the mechanism of cation order-disorder phase transition and estimation of the phase transition temperature is of paramount importance for tuning of properties of such double perovskites. In this work, based on the earlier proposed cation-anion elastic bonds model, a theory of order-disorder phase transitions of B-cations in AB'B-1/2''O-1/2(3) perovskites is presented,which allows reliable estimation of the phase transition temperatures and of the reduced lattice constants of such double perovskites.
引用
收藏
页码:264 / 273
页数:10
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