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Heat treatment enhancement of natural orange-red sapphires
2012
Advances in Materials Science
Certain variety of Madagascar color sapphires (fancy sapphires) has orange-red color, which shades don't let to consider them as the rubies. Heat treatment experiments in reducing atmosphere were carried out on such sapphires for the purpose of improving their color characteristics. Chromium (III), iron (II and III), titanium (IV) chromophore impurities in natural corundum and chromophore centers with their participitation are considered. A special attention is paid to spectral characteristics
doi:10.2478/v10077-012-0006-3
fatcat:5yz5unkkgzgspph57fo4adob34