Structural, thermodynamic, and kinetic aspects of disordering in the pseudobrookite-type compound karrooite, MgTi2O5

N. E. Brown, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

The pseudobrookite-type compound karrooite (MgTi2O5) has been studied to understand how cation disordering, coupled with tight constraints of symmetry, affects its structural and thermodynamic properties and to address the kinetics of ordering. An empirical model that determines the degree of cation disorder from the c lattice parameter, along with the enthalpy data, has allowed assessment of various thermodynamic models of disordering. A sigmoidal change in lattice parameters with increasing quench temperature results from slow ordering at T < 973 K and from unquenchable cation distributions (ie, extremely rapid ordering) at T > 1273 K. The activation energy of ordering at T < 973 K is 212 ± 10 kJ/mol. -from Authors

Original languageEnglish (US)
Pages (from-to)902-912
Number of pages11
JournalAmerican Mineralogist
Volume74
Issue number7-8
StatePublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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