Thermodynamics of formation of the silicates and germanates of some divalent transition metals and of magnesium

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Abstract

The enthalpies of formation of Mg2SiO4, Co2SiO4, Ni2SiO4, Zn2SiO4, Mg2GeO4, MgGeO3, Co2GeO4, CoGeO3, Ni2GeO4, and Zn2GeO4 from the component oxides were measured by solution calorimetry in a molten oxide solvent at 692±2°C. Regularities in the thermodynamics of formation of the silicates and germanates of Mg, Mn, Fe, Co, Ni, Cu, and Zn are discussed, entropies of formation calculated when possible, and some thermodynamic manifestations of the possible polymorphism (olivine, spinel, phenasite) in these systems are noted.

Original languageEnglish (US)
Pages (from-to)4035-4050
Number of pages16
JournalJournal of Inorganic and Nuclear Chemistry
Volume33
Issue number12
DOIs
StatePublished - Dec 1971
Externally publishedYes

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