Measured Enthalpy and Derived Thermodynamic Properties of Crystalline and Liquid Potassium Chloride, KCl, from 273 to 1174 K.

Thomas B Douglas, Ann W Harman
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引用次数: 5

Abstract

The enthalpy of KCl relative to that at 273.15 K was precisely measured by drop calorimetry from 273 to 1174 K, and smooth thermodynamic functions were derived for this temperature range. The heat capacities found for the crystalline phase join smoothly the most precise published data for lower temperatures; those for the liquid phase are temperature-independent within the precision of measurement over the 120° range covered. It is concluded that the broad exponential upturn of the heat-capacity curve below the melting point, if attributed to lattice vacancies, indicates a predominance of large vacancy clusters.

结晶和液态氯化钾KCl在273-1174K范围内测得的焓和导出的热力学性质。
在273-1174K范围内,通过滴热法精确测量了KCl相对于273.15K温度下的焓,并推导出了该温度范围内的光滑热力学函数。晶相的热容与较低温度下最精确的公布数据平滑结合;在所涵盖的120°范围内,液相的温度与测量精度无关。结果表明,如果归因于晶格空位,热容曲线在熔点以下的大指数上升表明大空位团簇占主导地位。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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