Study of structural and valence state of Cr and Fe in chrysoberyl and alexandrite with EPR and M?ssbauer spectroscopy |
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| Authors: | V S Urusov N A Gromalova S V Vyatkin V S Rusakov V V Maltsev and N N Eremin |
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| Institution: | (1) Fachbereich Materialforschung und Physik, Abteilung Mineralogie, Paris-Lodron-Universit?t Salzburg, Hellbrunnerstr. 34, 5020 Salzburg, Austria;(2) Abteilung Mineralogie und Petrographie, Naturhistorisches Museum Wien, Burgring 7, 1014 Wien, Austria |
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| Abstract: | Data on the structural and valence distribution of Cr and Fe in chrysoberyl and in alexandrite, its gem variety, are given.
It is shown that the Cr3+ line in the natural Ural and Tanzania samples is the strongest in the M1 site and for the synthetic stones, in the M2 site.
During the annealing of the alexandrite crystals, Cr3+ passes from the smaller M1 site into the larger M2 site. The M?ssbauer spectroscopy quantitatively determined the distribution
of different valence Fe ions. The various proportions of both Fe2+ and Fe3+ ions isomorphically entering the octahedral sites in the BeAl2O4 crystal structure were established. |
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