Abstract
Vicker’s microhardness measurements have been carried out on single crystals of CaF2, SrF2, BaF2, CdF2, PbF2, EuF2, ThO2, NaClO3, NaBrO3, Bi4 (GeO4)3, Bi4(SiO4)3, Bi12GeO20 and Bi12SiO20. The hardness values are discussedvis-a-vis the interatomic binding in these crystals. While most of the fluorite-type crystals are highly ionic, covalency is indicated in the bismuth compounds studied.
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