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The author presents a study of the influence of an external electric field on the incommensurate-commensurate phase transition in K 2 SeO 4 - and (NH 4 ) 2 BeF 4 -like crystals. Within the constant-amplitude approximation the same type of thermodynamic potential is found in both cases. The phase diagram in the E-T phase plane is found and should exhibit a Lifshitz point. The susceptibility of the incommensurate phase diverges at the transition point while that of the commensurate phase remains finite.
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O. Hudák (1983) studied this question.
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