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- W2012109632 abstract "Natural topaz crystals of gem quality and orange-red colour from the Ouro Preto area, Brazil have been analysed chemically and investigated by optical absorption and electron paramagnetic resonance measurements to elucidate the reason of the special orange-red colour. In all topazes the transition elements V, Mn, Ti, Cr and Fe were found. V occurs as V 4+ . Mn seems to be substituted as Mn 3+ not detectable by EPR at X-band frequencies and Ti as Ti 4+ which is inactive for both EPR and optical absorption. Cr and Fe have been found in the valence states Cr 3+ and Fe 3+ , respectively. The orange-red colour is related to two electron centres with g eff -values of 1.96 and 1.91, respectively, because both the electron centres and the absorption bands responsible for the orange-red colour can be bleached by thermal treatment whereas the EPR of V 4+ , Cr 3+ , Fe 3+ is not remarkably influenced by heating the samples up to 600 °C." @default.
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- W2012109632 date "2003-07-28" @default.
- W2012109632 modified "2023-09-26" @default.
- W2012109632 title "Spectroscopic study of natural gem quality Imperial-Topazes from Ouro Preto, Brazil" @default.
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- W2012109632 doi "https://doi.org/10.1127/0935-1221/2003/0015-0701" @default.
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