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Interstitial Sn2+ in synthetic and natural cassiterite crystals

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Abstract

Evidence for the presence of Sn2+ in an octahedral interstitial site in synthetic and natural cassiterite (SnO2) is presented. The absorption and relative absorption spectral peaks measured are similar to ones found in Sn2+-doped KI by absorption spectrophotometry and Sn2+-doped soda-silica glass by reflection spectroscopy. The estimated quantity of interstitial Sn2+ present is found by calculating that needed to balance the uncompensated M3+ impurity in substitutional Sn4+ sites where M3+ is mainly Al3+ and Fe3+. Estimates of the oscillator strengths of three Sn2+ bands detected by absorption spectrophotometry in the synthetic crystal are given. The interstitial Sn2+ content in synthetic and natural cassiterite is not affected by heating,60Co gamma irradiation, or UV light treatment with a high pressure xenon-mercury lamp.

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Cohen, A.J., Adekeye, J.I.D., Hapke, B. et al. Interstitial Sn2+ in synthetic and natural cassiterite crystals. Phys Chem Minerals 12, 363–369 (1985). https://doi.org/10.1007/BF00654347

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