Disordering energy versus disorder in minerals: A phenomenological relation and application to orthopyroxene

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4 Scopus citations

Abstract

Many minerals, such as pyroxenes and amphiboles, show nonconvergent disordering and, therefore, cannot be treated in terms of the classic Bragg and Williams theory. A simple phenomenological model has been developed that is applicable to nonconvergent disordering and reduces to the well-known Bragg and Williams relation for the energy change of disordering from the state of complete order for the special case of linear convergent disordering and 'simple mixture' behavior for the whole crystal. The model has been applied to calculate the energetic parameters of disordering in orthopyroxene from site occupancy and calorimetric data, and compared with the measured or independently derived values of these parameters.

Original languageEnglish (US)
Pages (from-to)417-420
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume47
Issue number4
DOIs
StatePublished - 1986

Keywords

  • activity coefficient
  • disordering energy
  • intracrystalline distribution coefficient
  • long-range order
  • nonconvergent disordering
  • orthopyroxene
  • simple mixture
  • site occupancy

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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