A phenomenological theory of the incommensurate phase transition which occurs close to the alpha - beta transition in quartz is presented. This theory assumes that the coupling between the soft optic mode of the alpha - beta transition and the acoustic modes play an important role in the formation of the modulated structure. According to the values of the phenomenological parameters, different kinds of incommensurate structures can form, in particular single-k or triple-k structures. The available experimental data concerning the quartz transition are discussed.
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Aslanyan et al. (1983) studied this question.
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