Revelation of causes of colour change in beryllium-treated sapphires
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Author list: Limsuwan P., Meejoo S., Somdee A., Thamaphat K., Kittiauchawal T., Siripinyanond A., Krzystck J.
Publisher: IOP Publishing
Publication year: 2008
Journal: Chinese Physics Letters (0256-307X)
Volume number: 25
Issue number: 6
Start page: 1976
End page: 1979
Number of pages: 4
ISSN: 0256-307X
eISSN: 1741-3540
Languages: English-Great Britain (EN-GB)
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Abstract
Blue sapphires are treated with Be in oxidizing atmosphere to change the blue colour into yellow. Untreated and Be-treated samples are examined using laser ablation inductively coupled-plasma-mass spectrometry (LA-ICP-MS), electron spin resonance (ESR) and ultraviolet-visible (UV-vis) spectroscopy. The results show that the yellow colouration in Be-heated blue sapphires is not due to Be diffusion from the surface of sapphire. Be behaves as a sole catalyst in this process. We find that the charge transfer between the ferrous (Fe 2+) and ferric (Fe3+) is the reason of the colour change. The above conclusions are confirmed by ESR measurements to determine the connections between the Fe3+ ions before and after Be-treated heat treatments. ฉ 2008 Chinese Physical Society and IOP Publishing Ltd.
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