Changes in Blue Color of Sapphire Compared with Oxidation State Changes
Ratthaphon Amphon,
Chawalit Chankhantha,
Chanisara Srimuang
et al.
Abstract:Blue sapphire has long been treated with heat to modify its blue color and attain greater value. However, the process of modifying the blue color in sapphire remains not well understood. The color-changing mechanism has traditionally been explained using the Intervalence Charge Transfer (IVCT) (Fe2+-Ti4+ and/or Fe2+-Fe3+) theory, wherein the blue color can be diminished by heat treatment in an oxidizing environment which alters Fe2+ (FeO) to Fe3+ (Fe2O3) and decreases the occurrence of the IVCT process. Howeve… Show more
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