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Science 24 September 1976:
Vol. 193. no. 4259, pp. 1241 - 1242
DOI: 10.1126/science.193.4259.1241
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Articles

Entropy Estimates for Some Silicates at 298°K from Molar Volumes

SURENDRA K. SAXENA 1

1 Department of Geology, Brooklyn College, City University of New York, New York 11210

Third law entropies for silicates of Be, Mg, Ca, Zn, Na, and K containing the same anion group, for example, SiO4 or SiO3 or AlSi3O8, are found to be linearly related to their molar volumes. The relationship between the molar volume and the entropy of silicates of Fe and Mn, atoms with unfilled d electron subshells, is different from that of other silicates. The linear correlations yield a useful method of estimating the entropies of ortho-, meta-, and framework silicates (feldspars and feld-spathoids). The estimated entropies of pyrope and almandine at 298°K are 47.47 and 68.13 gibbs per mole, respectively.

Submitted on February 20, 1976
Revised on April 21, 1976


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Entropy Estimates of Garnets and Other Silicates.
S. Cantor and S. CANTOR (1977)
Science 198, 206-207
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Science. ISSN 0036-8075 (print), 1095-9203 (online)