Heat Capacity of Ammonium Chloride between 8 and 300 K
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概要
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Heat capacity of NH<SUB>4</SUB>Cl was measured between 8 and 300 K with an adiabatic calorimeter. The low-temperature limit of the Debye temperature is 352 K and its high-temperature limit in the harmonic approximation is 285 K. The λ transition point <I>T</I><SUB>λ</SUB> is 242.502±0.004 K with the heat of transition 1168 J mol<SUP>−1</SUP> and the entropy of transition 5.00 JK<SUP>−1</SUP> mol<SUP>−1</SUP>. It is very close to the first-order transition. From the analysis of the heat capacity between 242 and 300 K, an extra contribution to the heat capacity that amounts to 11.5 JK<SUP>−1</SUP> mol<SUP>−1</SUP> at 300 K is extracted and explained by a simple model which assumes an additional type of order-disorder in the arrangment of NH<SUB>4</SUB> ions above <I>T</I><SUB>λ</SUB>. The energy difference between the parallel and the antiparallel pairs of NH<SUB>4</SUB> ions is estimated to be 1.46 kj mol<SUP>−1</SUP> from the low-temperature tail of the heat capacity anomaly near <I>T</I><SUB>λ</SUB>.
- 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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Chihara Hideaki
Department of Chemistry, Faculty of Science, Osaka University
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