The temperature dependence of the cation distribution in magnesioferrite (MgFe2O4) from powder XRD structural refinements and Mossbauer spectroscopy

H. S.C. O'Neill, H. Annersten, D. Virgo

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Abstract

Magnesioferrite (MgFe2O4 spinel) was synthesized in equilibrium with excess MgO using a flux method. The cation distributions in quenched samples were determined using both powder X-ray diffraction and Mossbauer spectroscopy. The cation distribution changes smoothly with temperature, with the cation inversion parameter (x) decreasing from 0.90 at 450°C to 0.72 at 1100°C. The two sets of measurements agree well with each other. Thermodynamic modeling shows that the cation distribution can be described with a nonlinear enthalpy of disordering model, with αMg-Fe3+ = 26.6 ± 0.4 and β = -21.7 ± 0.3 kJ/g-atom. The results differ to a greater or lesser extent from most of the previous work on MgFe2O4. This is most likely attributable to differences in stoichiometry. -from Authors

Original languageEnglish
Pages (from-to)725-740
Number of pages16
JournalAmerican Mineralogist
Volume77
Issue number7-8
Publication statusPublished - 1992
Externally publishedYes

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