The thermodynamics of ordered perovskites on the CaTiO3-FeTiO3 join

J. Linton, A. Navrotsky, Y. Fei

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The enthalpies of formation from ilmenite, FeTiO3, and perovskite, CaTiO3, of two intermediate ordered perovskite phases, CaFeTi2O6 and CaFe3Ti4O12, have been measured at 801°C using oxide melt solution calorimetry. These data, in combination with experiments at high pressure and temperature, indicate that below 1518±50°C CaFe3Ti4O12 is stable at lower pressures (~7 GPa at 1200°C) than CaFeTi2O6 (~13 GPa at 1200°C). This relationship should be reversed, and CaFeTi2O6 should become stable at lower pressures than CaFe3Ti4O12, at temperatures above 1518±50°C. These intermediate phases are of petrological interest because they forms as a reaction between two minerals, ilmenite and perovskite, which are commonly associated in kimberlites, and because their pressure-temperature range of formation overlaps that of origin of kimberlites.

Original languageEnglish (US)
Pages (from-to)591-596
Number of pages6
JournalPhysics and Chemistry of Minerals
Volume25
Issue number8
DOIs
StatePublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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