Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/8377
Title: The unusual Mössbauer spectrum of beryl.
Authors: Viana, Rúbia Ribeiro
Costa, Geraldo Magela da
Evangelista, Hanna Jordt
Stern, Willem B.
Keywords: Beryl
Mössbauer spectroscop
Issue Date: 2001
Citation: VIANA, R. R. et al. The unusual Mössbauer spectrum of beryl. Hyperfine Interactions, v. 134, p. 193-197, 2001. Disponível em: <https://link.springer.com/article/10.1023/A:1013814217476>. Acesso em: 20 de jun. 2017.
Abstract: The Mössbauer spectra of several aquamarine samples have been obtained in the temperature range of 4.2–500 K. A common feature observed in all room-temperature spectra is the presence of an asymmetric Fe2+ doublet ( EQ ∼ 2.7 mm/s, δ ∼ 1.1 mm/s), with a very broad lowvelocity peak. This asymmetry is not caused by preferred orientation since the spectrum collected under the magic angle did not show any difference in the line intensities, nor is it caused by the superposition of a Fe3+ doublet. At 4.2 K the spectrum of a deep-blue beryl could be well fitted with three symmetrical doublets, with the major Fe2+ doublet accounting for 87% of the total spectral area. At 14 K the symmetry remains, but at 30 K the low-velocity peak is again broad. Surprisingly, the spectrum at 500 K also shows a broad, but symmetrical doublet, with a clear splitting of the lines indicating the presence of at least two Fe2+ components. The room-temperature spectrum obtained after the 500 K run shows the same features as before the heating. A meaningful fit for the roomtemperature spectrum, as well as an explanation for the temperature dependence of the Mössbauer spectra, are discussed.
URI: http://www.repositorio.ufop.br/handle/123456789/8377
metadata.dc.identifier.uri2: https://link.springer.com/article/10.1023/A:1013814217476
ISSN: 15729540 
Appears in Collections:DEGEO - Artigos de periódicos

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