Abstract

The densities of the KF–KCl–KI melts with KF/KCl molar ratios of 0.8 and 2 are measured as a function of the KI content by hydrostatic weighing. The measurements were performed in an inert atmosphere using structural materials resistant against the melts. The densities of the 45 mol % KF–55 mol % KCl–KI and 66.6 mol % KF–33.4 mol % KCl–KI melts with KI contents of from 0 to 100% were measured in a temperature range of 973–1073 K. KI additions to the KF–KCl melt were found to increase the density. The temperature dependences of the densities of the melts are described by linear functions. KI is found to increase the coefficient of temperature dependence of the density. Data on the densities of the KF–KCl–KI melts are used to calculate the molar volumes. Dependences of variations in the molar volume on the temperature and the melt composition are given. The molar volumes of the melts are shown to be close to those calculated by the additivity rule, which indicates that the initial salts are mixed without marked chemical interaction.

中文翻译：

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KF–KCl–KI熔体的密度

摘要

KF-KCl-KI熔体的摩尔比分别为0.8和2的KF-KCl-KI熔体的密度是通过静液压称量得到的KI含量的函数。使用抗熔体的结构材料在惰性气氛中进行测量。在973–1073 K的温度范围内，测量了KI含量为0至100％的45 mol％KF–55 mol％KCl–KI和66.6 mol％KF–33.4 mol％KCl–KI熔体的密度。发现向KF–KCl熔体中添加可增加密度。熔体密度的温度依赖性通过线性函数描述。发现KI增加了密度的温度依赖性系数。KF–KCl–KI熔体的密度数据用于计算摩尔体积。给出了摩尔体积的变化对温度和熔体组成的依赖。熔体的摩尔体积显示出接近于由加和法则计算出的摩尔体积，这表明混合了最初的盐而没有明显的化学相互作用。