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Título : | 57Fe-Mössbauer spectroscopy on natural eosphorite-childrenite-ernstite samples. |
Autor : | Costa, Geraldo Magela da Cipriano, Ricardo Augusto Scholz Karfunkel, Joachim Bermanec, Vladimir Chaves, Mario Luiz de Sá Carneiro |
Palabras clave : | Eosphorite Childrenite Ernstite Pegmatite Mössbauer spectra |
Fecha de publicación : | 2005 |
Citación : | COSTA, G. M. et al. 57Fe-Mössbauer spectroscopy on natural eosphorite-childrenite-ernstite samples. Physics and Chemistry of Minerals, v. 31, n. 10, p. 714-720, 2005. Disponível em: <http://link.springer.com/article/10.1007/s00269-004-0434-7>. Acesso em: 28 jan. 2013. |
Resumen : | Samples of the eosphorite-childrenite [(Mn2+, Fe2+)AlPO4(OH)2H2O] series from Divino das Laranjeiras and Araçuaí (Minas Gerais State) and Parelhas (Rio Grande do Norte State) pegmatites have been investigated by X-ray diffraction, microprobe analysis and Mössbauer spectroscopy at 295 and 77 K. The Mössbauer spectra of ernstite [(Mn2+, Fe3+)Al- PO4(OH)2-xOx] showed the existence of ferric ions in both A and B sites, whereas ferrous ions seem to be located exclusively in the A site. Nonoxidised samples show ferrous ions located in both sites, and no Fe3+ could be detected. The interpretation of the Mössbauer spectra of both, oxidised and nonoxidised samples, is difficult because the hyperfine parameters of these minerals are rather similar, rendering it difficult to make proper site assignments. |
URI : | http://www.repositorio.ufop.br/handle/123456789/2075 |
metadata.dc.identifier.uri2: | http://link.springer.com/article/10.1007/s00269-004-0434-7 |
ISSN : | 14322021 |
Aparece en las colecciones: | DEQUI - Artigos publicados em periódicos |
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Fichero | Descripción | Tamaño | Formato | |
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ARTIGO_Fe-MossbauerSpectroscopy.pdf Restricted Access | 476,87 kB | Adobe PDF | Visualizar/Abrir |
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