Basal-plane Incommensurate Phases in HCP Structures
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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