The origins of the colours of yellow, gr
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J. Ferguson; P.E. Fielding
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Article
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1971
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Elsevier Science
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English
โ 314 KB
The abkption jpectra of natural yellow sapphires are shown to be due to single Fe"+and Fe" -O'--Fe'+ pairs, with the latter dominant. Blue and green sapphires have spectra dominated by Fe'+ -O'--Ti4+ and Fea\* -O'--Fe'+ pairs.