Study of structural and valence state of Cr and Fe in chrysoberyl and alexandrite with EPR and Mössbauer spectroscopyстатья
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Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
Аннотация: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 Mössbauer 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.