Thermodynamic relations among olivine, spinel, and phenacite structures in silicates and germanates. III. The system CuO‒MgO‒GeO2

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Abstract

Phase relations in the system CuO{single bond}MgO{single bond}GeO2 in air at 1000°C were determined. Activity-composition relations in the system CuO{single bond}MgO at 1000°C were measured: the guggenite phase was found to exist over the composition range 0.695 < XCuO < 0.805. The enthalpy and free energy of formation of CuGeO3 were determined by high temperature solution calorimetry and reduction equilibria, respectively. For the reaction: CuO + GeO2 = CuGeO3,ΔG°1273 = -4.0kcal/mole, ΔH°988 = -5.2kcal/mole, ΔS° = -0.9cal/deg mole. The stability of rocksalt, tenorite, olivine, enstatite, and CuGeO2 structures in this system is discussed.

Original languageEnglish (US)
Pages (from-to)10-16
Number of pages7
JournalJournal of Solid State Chemistry
Volume11
Issue number1
DOIs
StatePublished - Sep 1974

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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