Calorimetric studies of crystalline and glassy high pressure phases.

A. Navrotsky, H. Fukuyam, P. K. Davies

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The enthalpies of phase transformation can be combined with free energies obtained from high pressure experiments to obtain accurate estimates of entropies of transition and independent assessment of pressure-temperature slopes. Transitions in the systems CoO- SiO2, 'FeO'-SiO2, and MgO-GeO2 have been studied by calorimetry, and the thermochemical and phase equilibrium data are in good agreement for the olivine-spinel transition, and stability fields of alpha , beta , and gamma -Co2SiO4, and the formation and breakdown of pyroxene. However, some discrepancies exist between calculated and experimental P-T slopes of spinel disproportionation reactions. Conclusions concerning crystal chemical systematics are drawn from NaC1-CsC1, DELTA SoC is not constant but varies strongly with DELTA VoC. The calorimetric data argue against any major changes in glass structure (coordination number) in these high pressure glasses.-Authors

Original languageEnglish (US)
Pages (from-to)465-477
Number of pages13
JournalUnknown Journal
StatePublished - 1982

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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