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Optical absorption spectroscopy and X-ray structural refinements were used to characterize short-range and long-range structures of 10 gem-quality, blue spinel single crystals synthesized on the (Mg 1-x Co x ) Al 2 O 4  solid solution (x = 0.07-1.00). The site distributions of Mg, Co 2+ , and Al show that the tetrahedrally coordinated site (T) is mainly populated by Mg and Co 2+ , with a marked preference of Co 2+  for tetrahedral coordination with respect to Mg, while the octahedrally coordinated site (M) is dominated by Al. Crystals also show a certain degree of inversion, i.e., occurrence of Al at T counterbalanced by the occurrence of divalent cations at M, which decreases from 0.24 to 0.13 with increasing Co 2+  content.

Blue spinel crystals in the MgAl 2 O 4 -CoAl 2 O 4 series: Part II. Cation ordering over short-range and long-range scales