Douglas Thomas B, Harman Ann W
Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.
J Res Natl Bur Stand A Phys Chem. 1974 Jul-Aug;78A(4):515-529. doi: 10.6028/jres.078A.035.
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.
通过滴定量热法精确测量了氯化钾相对于273.15 K时的焓，测量范围为273至1174 K，并得出了该温度范围内的平滑热力学函数。发现晶相的热容与已发表的较低温度下最精确的数据平滑衔接；在覆盖的120°范围内的测量精度内，液相的热容与温度无关。得出的结论是，如果将熔点以下热容曲线的宽指数上升归因于晶格空位，则表明存在大量空位簇。
