Benisek Artur, Dachs Edgar
Materialforschung und Physik, Universität Salzburg, Hellbrunnerstr. 34, A-5020 Salzburg, Austria.
J Chem Thermodyn. 2013 Jul;62(100):231-235. doi: 10.1016/j.jct.2013.03.015.
The heat capacity of one Na-rich and two K-rich samples of the NaCl-KCl (halite-sylvite) crystalline solution was investigated between 5 and 300 K. It deviated positively from ideal behaviour with a maximum at 40 K. The thereby produced excess entropy at 298.15 K was described by a symmetric Margules mixing model yielding [Formula: see text] = 8.73 J/mol/K. Using enthalpy of mixing data from the literature and our data on the entropy, the solvus was calculated for a pressure of 10 Pa and compared with the directly determined solvus. The difference between them can be attributed to the effect of Na-K short range ordering (clustering).
研究了NaCl-KCl（石盐-钾石盐）晶体溶液中一个富钠样品和两个富钾样品在5至300K之间的热容。其偏离理想行为呈正值，在40K时出现最大值。通过对称的马古勒斯混合模型描述了在298.15K时由此产生的过量熵，得到[公式：见原文] = 8.73 J/mol/K。利用文献中的混合焓数据和我们的熵数据，计算了10 Pa压力下的固溶度，并与直接测定的固溶度进行了比较。它们之间的差异可归因于Na-K短程有序（聚集）的影响。
