Thermodynamic studies on order-disorder phase transitions of p-terphenyl and p-terphenyl-d14.
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概要
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The heat capacities of <I>p</I>-terphenyl and <I>p</I>-terphenyl-<I>d</I><SUB>14</SUB> were measured by adiabatic calorimetry between 3 and 300 K. The phase transition associated with a molecular conformation change was observed as a λ-shaped anomaly at (193.5±0.1) K and at (180.3±0.1) K. The enthalpies of transition are (304±20) J mol<SUP>−1</SUP> and (288±20) J mol<SUP>−1</SUP> and the entropies of transition are (1.63±0.10) J K<SUP>−1</SUP> mol<SUP>−1</SUP> and (1.63±0.10) J K<SUP>−1</SUP> mol<SUP>−1</SUP>, respectively. The anisotropy of the intermolecular interaction is discussed and the anomalous portion of the heat capacities in the transition region was compared favorably with a two-dimensional Ising model.
- 公益社団法人 日本化学会の論文
著者
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Saito Kazuya
Department Of Aeronautics And Astronautics Graduate School Kyoto University
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Atake Tooru
Research Laboratory Of Engineering Materials Tokyo Institute Of Tachnology
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Chihara Hideaki
Department Of Chemistr Faculty Of Science Osaka University
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Chihara Hideaki
Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University
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