New ferroelastic K2Sr(MoO4)2: synthesis, phase transitions, crystal and domain structures, ionic conductivity

Tsyrenova, G.D.; Pavlova, E.Т.; Solodovnikov, S.F.; Popova, N.N.; Kardash, T.Y.; Stefanovich, S.Y.; Lazoryak, B.I.; Gudkova, I.А.; Solodovnikova, Z.A.

Авторы: Tsyrenova G.D., Pavlova E.Т., Solodovnikov S.F., Popova N.N., Kardash T.Yu, Stefanovich S.Yu, Lazoryak B.I., Gudkova I.А., Solodovnikova Z.A.
Журнал: Journal of Solid State Chemistry
Том: 237
Год издания: 2016
Издательство: Elsevier B.V.
Местоположение издательства: Netherlands
Первая страница: 64
Последняя страница: 71
DOI: 10.1016/j.jssc.2016.01.011
Аннотация: K2Sr(MoO4)2 crystals were synthesized and their properties examined. The distortive polymorphic transformations at 421 K (α (LT)→ β(MT)) and 744 K (β(MT)→γ (HT)) of K2Sr(MoO4)2 were studied. It has been shown that the transitions go in sequence from the high-temperature palmierite K2Pb(SO4)2-type γ-phase (R m) to an intermediate β-phase with a probable incommensurate structure and then to a low-temperature α-phase. Domain structures peculiarities in ferroelastic α-K2Sr(MoO4)2 have been investigated. The electrical conductivity of K2Sr(MoO4)2 rises tenfold in the vicinity of the phase transition at 744 K that may be associated with a change conductivity path from quasi-one-dimensional to two-dimensional. The crystal structure of the α-phase (sp. gr. С2/c, а=14.318(3) Å, b=5.9337(12) Å, с=10.422(2) Å, β=105.83(3)о, Z=4, R=0.0219) is similar to that of α-Pb3(PO4)2. Sr-atoms are mainly located at site with the coordination number CN=8 (a tetragonal antiprism with bond lengths of 2.578(2)–2.789(2) Å) and K atoms are located at site with CN=9+1)
Добавил в систему: Стефанович Сергей Юрьевич

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New ferroelastic K2Sr(MoO4)2: synthesis, phase transitions, crystal and domain structures, ionic conductivityстатья

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