Abstract

The Kirchhoff equation was used to develop a method for calculating the enthalpy of silicate melt of any arbitrarily chosen composition with regard for the latent heat of fusion. To do this, the following two problems were solved: (a) the coefficients of the heat capacity equation of a silicate melt were revised and (b) the partial molar enthalpies of formation of melt components from elements at standard state were determined. The uncertainty in calculating the heat capacity of silicate melt at 95% significance level is no greater than ±0.7 J mol^–1 K^–1. A weak but statistically significant temperature dependence of the heat capacity was determined. The enthalpies of melts calculated using the method are comparable with the values obtained by other techniques. The calculation error at 95% significance level is ±2 relative %.

中文翻译：

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计算任何成分硅酸盐熔体焓的技术

摘要

使用基尔霍夫方程式发展了一种方法，该方法可根据熔融潜热来计算任意选择组成的硅酸盐熔体的焓。为此，解决了以下两个问题：（a）修正了硅酸盐熔体的热容量方程的系数，以及（b）确定了标准状态下由元素形成的熔体组分的部分摩尔焓。在重要性水平为95％时计算硅酸盐熔体热容的不确定度不大于±0.7 J mol ^–1 K ^–1。确定了热容量的弱但具有统计意义的温度依赖性。使用该方法计算的熔体焓与通过其他技术获得的值相当。在95％显着性水平下的计算误差为±2相对％。