| Summary: | The distribution of cations between octahedral and tetrahedral sites in Fe3O4-FeAl2O4, Fe3O4-MgFe2O4, and Fe3O4-MgAl2O4 solid solutions has been detrmined in situ at 600°C to 1400°C and 1-atm pressure. The joint Fe3O4-MgFe2O4 fits reasonably well to either the simple constant KFe2+-Fe3+Cd and KMg-Fe3+Cd model (Navrotsky and Kleppa, 1967) or to the more complex O'Neill-Navrotsky (1983, 1984) model. Cation-distribution data for Fe3O4-FeAl2O4 solid solutions are in quantitative agreement with the O'Neill-Navrotsky model. Fe3O4-MgAl2O4 solutions are intermediate in behavior between the other two joins, their cation distributions being linear functions of tetrahedral trivalent ions and in broad agreement with the data for pure magnetite, hercynite, and magnesioferrite, respectively. -from Authors
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