Abstract:
The existence of tetragonally distorted octahedra found in a high-temperature cubic phase of some perovskites (LaMnO3, KCrF3, etc.) and the estimations performed make it possible to consider the observed orbital orderings as order–disorder phase transitions. The conditions of formation of ferro- and antiferrodistortive phase states described by the order parameters corresponding to reciprocal lattice vectors k = 0 и k1/2=(b1,b2,b3), have been determined using a three-minimum two-sublattice model. The model is shown to be applicable for description of phase transitions in some ion–molecular crystals.
Citation:
M. P. Ivliev, V. P. Sakhnenko, “Statistical theory of orbital ordering in perovskites based on a three-minimum two-sublattice model”, Fizika Tverdogo Tela, 58:12 (2016), 2340–2345; Phys. Solid State, 58:12 (2016), 2427–2433
\Bibitem{IvlSak16}
\by M.~P.~Ivliev, V.~P.~Sakhnenko
\paper Statistical theory of orbital ordering in perovskites based on a three-minimum two-sublattice model
\jour Fizika Tverdogo Tela
\yr 2016
\vol 58
\issue 12
\pages 2340--2345
\mathnet{http://mi.mathnet.ru/ftt9737}
\elib{https://elibrary.ru/item.asp?id=27368848}
\transl
\jour Phys. Solid State
\yr 2016
\vol 58
\issue 12
\pages 2427--2433
\crossref{https://doi.org/10.1134/S1063783416120064}
Linking options:
https://www.mathnet.ru/eng/ftt9737
https://www.mathnet.ru/eng/ftt/v58/i12/p2340
This publication is cited in the following 1 articles:
M. P. Ivliev, V. P. Sakhnenko, “Structural mechanisms and the thermodynamic description of the isosymmetric orbital ordering in rare-earth manganites”, Phys. Solid State, 61:11 (2019), 2026–2033