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- W4294692011 abstract "The color of yellow sapphire from Africa characterized by high iron content and low levels of other transition metal elements was changed from yellow to grayish-blue after high-temperature reduction annealing. Before reduction annealing, the optical absorption spectra showed that the outer d–d electron transitions of Fe3+ were the main coloring cause of yellow sapphires, but the charge transfer between O2− and Fe3+ may have a greater contribution. The change in lattice parameter indicates that Fe3+ is reduced to Fe2+ during reduction annealing, and adjacent Fe2+ and Fe3+ form an Fe2+-Fe3+ ion pair. The absorption caused by intervalence charge transfer of Fe2+-Fe3+ is the essential reason for the grayish-blue appearance of yellow sapphires after reduction annealing. The charge compensation mechanism of Fe2+-Fe3+ in natural sapphire is also discussed, and oxygen vacancy is considered to be the most suitable charge compensator for Fe2+-Fe3+." @default.
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- W4294692011 date "2022-09-05" @default.
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- W4294692011 title "Effect of Reduction Annealing on the Coloration Mechanism of Yellow Sapphire with High Iron Content" @default.
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- W4294692011 doi "https://doi.org/10.3390/cryst12091257" @default.
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