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Some Semiempirical Methods for Estimating the Entropies of Oxides, Silicates, and the Prediction of Reaction Equilibria and Yields
Author(s) -
KNAPP W. J.,
VORST W. D.
Publication year - 1951
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1951.tb13019.x
Subject(s) - silicate , lattice energy , thermodynamics , ceramic , mineralogy , calcium silicate , inorganic chemistry , materials science , chemistry , organic chemistry , metallurgy , crystal structure , physics , composite material
Several methods are reviewed for computing the entropies of crystalline inorganic oxides, silicates, and titanates. A method relating entropies with molecular weights is used for oxides. The entropies of silicates and titanates may be estimated with the sums of the entropies of oxides with which they may be considered to be formed. Calculations are suggested to obtain free energy changes for reactions in systems of ceramic materials. Free energy calculations will allow for the prediction of reaction equilibria and yields. An example is given for the reaction at 1100°C. between calcia and silica to form calcium silicate.