Phenomenological approach to structural phase transitions in trigonal double molybdates and tungstates
A. I. OtkoPhysico‐Technical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR. KharkovN. M. NesterenkoPhysico‐Technical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR. KharkovL. V. PovstyanyiPhysico‐Technical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR. Kharkov
1978en
ABI
Аннотация
Structural phase transitions are investigated in crystals of the isostructural compounds MRA2 (M alkali metal, R trivalent metal, A anion (MoO4)2- or (WO4)2-). A group-theoretical analysis of possible transitions is carried out. It is shown that the transitions are of pure ferroelastic nature, occur between centrosymmetric phases: D (C or C) C, and may proceed continuously. Changes of the macroscopic crystal properties, behaviour of elastic waves, and permissible orientations of domain walls in various phases are studied. [Russian Text Ignored].
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