The quartz-coesite-stishovite transformations: new calorimetric measurements and calculation of phase diagrams

Masaki Akaogi, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

118 Scopus citations

Abstract

High temperature solution calorimetry of synthetic quartz, coesite and stishovite provides enthalpies of transition. ΔH9750 for quartz-coesite and ΔH2980 for coesite-stishovite transition are 320 ± 70 and 11700 ± 410 cal mol-1, respectively. The present transformation enthalpy data represent a small but significant revision of those of Holm et al. Using the published phase equilibrium data, thermal expansivity, compressibility and heat capacity data, ΔS9750 for the quartz-coesite and ΔS2980 for the coesite-stishovite transition are -1.2 ± 0.1 and -1.0 ± 0.4 cal K-1 mol-1, respectively. These thermochemical data are used to calculate phase boundaries of the transitions. The calculated quartz-coesite transition boundary agrees well with the one determined experimentally by Bohlen and Boettcher. The calculated coesite-stishovite boundary is generally consistent with data by Yagi and Akimoto and by Suito.

Original languageEnglish (US)
Pages (from-to)124-134
Number of pages11
JournalPhysics of the Earth and Planetary Interiors
Volume36
Issue number2
DOIs
StatePublished - Dec 1 1984

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

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