期刊
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS
卷 74, 期 -, 页码 264-273出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S205252061800392X
关键词
order-disorder phase transitions; phase transitions; AB'B-1/2''O-1/2(3) perovskites; B-cations; lattice constants
资金
- Russian Foundation for Basic Research [17-02-00616]
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.
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