3. a. Classify the following minerals:CaZrO3, FeCr2O4, SrTiO3, ZnAl2O4; as spinels or perovskites. Show how you...

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Chemistry

3. a. Classify the following minerals:CaZrO3, FeCr2O4, SrTiO3,ZnAl2O4; as spinels or perovskites. Show how you came to thisclassification.
b. Describe the important electrical and/or magnetic propertiesof spinels, perovskites and non-stoichiometric oxides. (Note: ifyou quote directly from the textbook or other source please use anappropriate citation).

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4.4 Ratings (734 Votes)

a The general formula for Perovskites are ABX3 and they are named after the mineral Perovskite that has the composition CaTiO3 In its ideal form the perovskite structure is a cubic closed pack structure In this structure the Ca cations are cuboctahedrally surrounded by 12 oxygen ions and the Ti cations are octahedrally surrounded by 6 oxygen ions So here the molecules CaZrO3 and SrTiO3are of ABX3 type and belongs to prevoskites structure In spinels the oxygen ions are forming a cubic close packed structure There are two kinds of spinels normal spinel with the general formula AB2X4 and inverse spinel with the general formula BABO4 So See Answer

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