Metamict transformations in some niobates and zircons according to X-ray absorption spectra |
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Authors: | R L Barinsky I M Kulikova |
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Institution: | 1. Institute of Mineralogy, Geochemistry and Crystallochemistry of Rare Elements, Academy of Sciences of the USSR, Sadovnicheskaya Embankment 71, 113127, Moscow, USSR
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Abstract: | The niobium and zirconium L III-absorption spectra in some niobates and zircons were obtained with a vacuum focusing crystal spectrometer. The effective charges of Nb and Zr in these minerals were derived from the X-ray absorption spectra. The fine structure of the absorption spectra and effective charges Nb and Zr in metamict, partly-metamict minerals and crystalline analogues made it possible to draw a conclusion as to the nature of the first coordination sphere of Nb and Zr during metamict decay and subsequent recrystallization under annealing of these minerals. |
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