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Sawada, Akikatsu

Takagi, Yutaka

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Title5)On the Phase Transition of K_2SeO_4Author(s)Takagi, Yutaka; Sawada, AkikatsuCitation物性研究 (1976), 25(6): B7-B7Issue Date1976-03-20URL http://hdl.handle.net/2433/89113RightType Departmental Bulletin PaperTextversionpublisherKyoto UniversityComments on the Lifshitz conditionsYoshihiro Ishibashi, Akikatsu Sawada and Yutaka TakagiIt is known that there are many phase transitions triggered by irreducible represen-tations which are inactive from the viewpoint of the Lifshitz condition.We examine this feature by studying concretely the Fourier-transformed dipoleinteraction matrix based on the model which reflects the symmetry aspect of the Rochellesalt crystal.On the Phase Transition of K2 Se04Yutaka Takagi and Akikatsu Sawada9It seems almost certain that the M phase of K2Se04 belongs to Pna2 1 (e2v),though the crystal lacks the evidences of the polar nature. This apparent contradictioncan be solved by assuming that the high temperature phase of the crystal belongs toD6~' and the M phase arises as the greatest common measure of two orthorhombic non-polar phases D~ ~ and D~ ~ which are, respectively, induced by the modulations of the1 * 1 * 1 *wave vectors k = "2 a2, and k = "2 a2 + "3 a3·-B7-

5)On the Phase Transition of K_2SeO_4

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5)On the Phase Transition of K_2SeO_4

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