Thermodynamic relations among olivine, spinel, and phenacite structures in silicates and germanates: II. The systems NiOZnOGeO2 and CoOZnOGeO2

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11 Scopus citations

Abstract

Activity-composition relations along the orthogermanate joins of the systems NiOZnOGeO2 and CoOZnOGeO2 at 1050°C have been determined from the phase diagrams and the location of conjugation lines between oxide and orthogermanate phases. In each system, a second distinct spinel phase near XZn2GeO4 = 0.5 is observed in addition to the terminal spinel and phenacite solid solution. The free energies of transformation from the spinel to the phenacite structure are estimated to be +23, +12.7, and -12.6 kcal/mole for Ni2GeO4, Co2GeO4, and Zn2GeO4, respectively.

Original languageEnglish (US)
Pages (from-to)42-47
Number of pages6
JournalJournal of Solid State Chemistry
Volume6
Issue number1
DOIs
StatePublished - Jan 1973

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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