Prediction of Gibbs energies of formation of compounds from the elements--II. Monovalent and divalent metal silicates

Details Prediction of Gibbs energies of formation of compounds from the elements--II. Monovalent and divalent metal silicates Prediction of Gibbs energies of formation of compounds from the elements--II. Monovalent and divalent metal silicates

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41...87t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 1, pp.87-92

Physics

6

Scientific paper

A parameter O 2- , defined as the difference between the Gibbs energy of formation of a given oxide and its aqueous cation, was used to obtain linear relationships among Gibbs energies of formation from the elements of hydroxides, oxides and aqueous metallic ions (Tardy and Garrels, 1976). Use of this parameter has now been extended to meta- and orthosilicates for which the Gibbs energies of formation of silicates from their oxides are shown to be linear functions of the O 2- values of their constituent cations. The function obtained for metasilicates is: and that for orthosilicates is: in which o f silicate is the Gibbs energy of formation from the elements of a silicate of a given cation and G o f oxides is the sum of the Gibbs energies of formation from the elements of the constituent oxides of the silicate considered. These functions can be used to test for consistency within and between various sources of thermodynamic data and to estimate free energy of formation values for previously unstudied species.

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