Temperature dependence of the cation distribution in CoAl2O4 spinel

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The cation distribution in synthetic CoAl2O4 spinel has been determined in samples quenched from 750 to 1200°C, by Rietveld structure refinement of powder X-ray diffraction data. The inversion parameter, x, increases smoothly from 0.11 at 750°C to 0.25 (± 0.005) at 1200°C, and can be described by a conventional thermodynamic model with αCo-Al = 45.3 ± 0.5 and β = -18.3 ± 1.2 kJ/mol. The β term agrees well with the -20 kJ/mol suggested for all 2-3 spinels by O'Neill & Navrotsky (1984), and CoAl2O4 thus behaves similarly to the majority of other oxide spinels which show temperature-dependent cation distributions. -from Author

Original languageEnglish
Pages (from-to)603-609
Number of pages7
JournalEuropean Journal of Mineralogy
Issue number5
Publication statusPublished - 1994
Externally publishedYes

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