Basal-plane Incommensurate Phases in HCP Structures
I. Luk'yanchuk, A. Jorio, M. A. Pimenta
Abstract
An Ising model with competing interaction is used to study the appearance of incommensurate phases in the basal plane of an hexagonal closed-packed structure. The calculated mean-field phase diagram reveals various 1q-incommensurate and lock-in phases. The results are applied to explain the basal-plane incommensurate phase in some compounds of the A'A"BX4 family, like K2MoO4, K2WO4, Rb2WO4 and to describe the sequence of high-temperature phase transitions in other compounds of this family.
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