Open AccessA technique for calculating the enthalpy of silicate melt of arbitrary composition
Author(s) -
Д. А. Бычков,
E. V. Koptev–Dvornikov
Publication year - 2019
Publication title -
petrologiâ
Language(s) - English
Resource type - Journals
ISSN - 0869-5903
DOI - 10.31857/s0869-5903272123-137
Subject(s) - silicate , thermodynamics , enthalpy , heat capacity , enthalpy of fusion , composition (language) , equation of state , fusion , materials science , chemistry , mineralogy , physics , organic chemistry , linguistics , philosophy , differential scanning calorimetry
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 %.