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dc.contributor.authorCosta, Geraldo Magela da-
dc.contributor.authorPolli, Gabriel de Oliveira-
dc.contributor.authorKahwage, Márcio A.-
dc.contributor.authorGrave, Eddy De-
dc.contributor.authorSabioni, Antônio Claret Soares-
dc.contributor.authorMendes, Julio Cesar-
dc.identifier.citationCOSTA, G. M. da et al. The effect of thermal treatment on the 57Fe Mössbauer spectrum of beryl. Physics and Chemistry of Minerals, v. 33, n. 3, p. 161-166, maio 2006. Disponível em: <>. Acesso em: 08 mar. 2017.pt_BR
dc.description.abstractMo¨ssbauer spectra (MS) of blue, green and yellow beryl (ideally Be3Al2Si6O18) containing approximately 1% of iron were obtained at 295 and 500 K. Room temperature (RT) spectra of both blue and green samples showed the presence of an asymmetric Fe2+ doublet (DEQ 2.7 mm/s, d 1.1 mm/s), with a very broad low-velocity peak. There is no clear evidence for the presence of a ferric component. The MS of the yellow sample at RT consists of an intense central absorption with parameters typical for Fe3+ (DEQ 0.4 mm/s, d 0.29 mm/s), plus an apparently symmetrical Fe2+ doublet. This sample acquires a lightblue shade upon heating in air at about 620 K. Thermal treatments at high temperatures caused no significant changes in the MS, but the green and yellow beryl acquire a blue colour. All these results are interpreted in relation to the existence of channel water and the distribution of iron among the available crystallographic sites.pt_BR
dc.subjectThermal treatmentpt_BR
dc.subjectMössbauer spectroscopypt_BR
dc.titleThe effect of thermal treatment on the 57Fe Mössbauer spectrum of beryl.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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