Abstract
New methods for processing the experimental and calculated thermodynamic data have been elaborated and the existing ones have been improved. The developed approaches provide a physically reasonable description of the first-order phase transitions, which makes it possible to compare and correct the values of their thermodynamic properties, as well as to calculate the thermodynamic parameters of unstudied compounds. Regression equations have been proposed for calculating the standard entropy and enthalpy of formation of lithium, sodium, and potassium silicates and borates. The resulting entropy and enthalpy values for 14 alkali metal silicates and 12 alkali metal borates can be used to optimize the technological processes for manufacturing glass, ceramics, and coatings.
Highlights
Systematic comparative analysis of temperature dependences of thermodynamic potentials within a broad range of concentrations and temperatures is used to calculate the excess thermodynamic functions of crystals and glasses required to create the physicochemical model of oxide systems and to compare the resulting thermodynamic data with the structure of compounds
The thermodynamic values have been matched using descriptive amount of isostructural compounds; the calculations have been simultaneously performed for potassium, lithium, and sodium silicates
The standard enthalpy of formation of lithium, sodium, and potassium silicates is a function of composition:
Summary
Systematic comparative analysis of temperature dependences of thermodynamic potentials within a broad range of concentrations and temperatures is used to calculate the excess thermodynamic functions of crystals and glasses required to create the physicochemical model of oxide systems (silicate, borate, germanate, etc.) and to compare the resulting thermodynamic data with the structure of compounds. The reason is that the thermodynamic properties of sodium, potassium, and lithium silicates given in reference books [1,2,3] significantly differ due to characteristics of the methods used for processing and estimating the calorimetric data. Currently there is no unified matched database of thermodynamic data suitable for creating an adequate physicochemical model that would include silicate and borate
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