Heat Capacity of Solid Phosphorus Pentachloride between 4 and 150 K. Nature of the Transition at 102 K.
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概要
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Molar heat capacity of solid P<SUB>2</SUB>Cl<SUB>10</SUB> was measured between 4 and 150 K with an adiabatic calorimeter, with particular attention to the phase transition at 102.0±0.2 K. The heat and entropy of the transition were 148±3 Jmol<SUP>−1</SUP> and 1.67±0.03 JK<SUP>−1</SUP>mol<SUP>−1</SUP>. Shape and magnitude of the anomalous heat capacity depend on the method of preparation. Anomaly in the heat capacity begins at about 75 K, rises gradually to a maximum of 9.12±0.08 JK<SUP>−1</SUP>mol<SUP>−1</SUP> at 102.0 K and tails off at about 110 K. The shape of the excess heat capacity curve can be explained satisfactorily by the librational soft-mode theory which assumes that PCl<SUB>6</SUB> anions tend to change equilibrium orientation with temperature.
- 公益社団法人 日本化学会の論文
著者
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Chihara Hideaki
Department Of Chemistr Faculty Of Science Osaka University
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Nakamura Minoru
Department Of Biology Graduate School Of Science Osaka University
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Masukane Kazuyuki
Department of Chemistry, Faculty of Science, Osaka University
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