Redetermination of the chromium position in ruby

Abstract
Results of a least-squares refinement utilizing three-dimensional, single-crystal, x-ray-diffraction, intensity data from a ruby with 5.2 mole % Cr2O3 shows that Cr is disordered in the cation site of the corundum structure, but displaced (not significant) about 0.03 Å toward the nearest cation along c.

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