Thermodynamic relations among olivine, spinel, and phenacite structures in silicates and germanates. IV. The system ZnOMgOGeO2

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Abstract

Phase relations in the system ZnOMgOGeO2 were determined at 1200°C in air. Subsolidus phase relations along the pseudobinary join Zn2GeO4Mg2GeO4 were determined between 700 and 1200°C, the portion below 900°C was obtained hydrothermally. Only one spinel phase is formed at low temperatures; this phase extends from Mg2GeO4 to (Mg0.73Zn0.27)2GeO4 at 820°C. Its highest temperature of stability is 880°C, with a composition of (Mg0.75Zn0.25)2GeO4. The free energies of transformation from the olivine to the phenacite structures at 1200°C are estimated to be + 6 ± 1.0 kcal/mole and - 10 ± 1.5 kcal/mole for Mg2GeO4 and Zn2GeO4, respectively.

Original languageEnglish (US)
Pages (from-to)12-15
Number of pages4
JournalJournal of Solid State Chemistry
Volume12
Issue number1-2
DOIs
StatePublished - Jan 1 1975

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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