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Crystal Chemistry of Some AB2O4 Compounds

1963; Wiley; Volume: 46; Issue: 8 Linguagem: Inglês

10.1111/j.1151-2916.1963.tb11755.x

1551-2916

F. P. Glasser, Leslie Glasser,

Luminescence Properties of Advanced Materials

Compounds having the formulas BaGa2O4, BaCr2O4, BaFe2O4, PbAL2O4, PbGa2O4, PbCr2O4, SrAl2O4, SrGa2O4, and SrCr2O4 were synthesized by heating oxide or carbonate mixtures. All were examined by X-ray powder techniques. Single crystals of BaCr2O4, SrAl2O4, SrGa2O4, and BaGa2O4 were also examined. SrAl2O4, SrGa2O4, and BaGa2O4 are structurally similar to BaAl2O4 and are thus related to tridymite (SO2). The occurrence of these stuffed tridymite structures, as well as the other principal structures encountered (spinel, CaFe2O4, and perovskite types) can be correlated with the ionic radii of the cations. New special structures peculiar to one compound, e.g., α-CaCr2O4, occur at radius ratio values representing a transition between two principal structure types.