Phase transition in ammonium-d4 sulfate as studied by heat capacity measurements between 3 and 300 K.
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概要
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Molar heat capacities were determined of (ND<SUB>4</SUB>)<SUB>2</SUB>SO<SUB>4</SUB> between 2.8 and 301 K. The phase transition at 223.94±0.03 K is of the first-order with a long tail extending down to 160 K. The overall heat and entropy of transition are 4270 J mol<SUP>−1</SUP> and 20.35 JK<SUP>−1</SUP> mol<SUP>−1</SUP>, respectively, the first-order portion contributing only 40%. The contraction of the molar volume at the transition was evaluated as 0.33 cm<SUP>3</SUP> mol<SUP>−1</SUP>. The enthaply to misorient ions in an otherwise perfectly ordered lattice was derived from the low-temperature tail of the anomalous heat capacity. It was 12.0 kJ/mol of (ND<SUB>4</SUB>)<SUB>2</SUB>SO<SUB>4</SUB>, in reasonable agreement with 16 kJ mol<SUP>−1</SUP> derived from O'Reilly-Tsang's mean field theory. The present results support the order-disorder mechanism of the transition.
- 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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Higashigaki Yoshiyuki
Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University
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