Mechanism of the ferroelectric phase transition in K4[Fe(CN)6] 3H2O and K4[Fe(CN)6] 3D2O.
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概要
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Mechanism of the ferroelectric phase transition in potassium hexacyanoferrate trihydrate is discussed from static and dynamic points of view, and a new model is proposed. The model takes into account four states as accessible for a water trimer, instead of two in the earlier model. If the four states were equally probable in the disordered phase, the predicted transition entropy is <I>R</I> In 4 compatible with the experimental value. It is expected that a glass transition, if possible, occurs at 50–60 K for the model. Since the anomalous heat capacity in this temperature region is effectively zero, the model is consistent with absence of a glass transition. Occupancy fractions of hydrogen sites are given for the earlier and the present models.
- 公益社団法人 日本化学会の論文
著者
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Seki Syuzo
Department Of Chemistry Faculity Of Science Osaka University
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Suga Hiroshi
Department Of Chemistry Faculty Of Science Osaka University
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MATSUO Takasuke
Department of Chemistry and Microcalorimetry Research Center, Faculty of Science, Osaka University
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Oguni Masaharu
Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University
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Matsuo Takasuke
Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University
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Suga Hiroshi
Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University
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