On the yellow color of gamma‐irradiated brazilianite from Minas Gerais (Brazil).

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorPinheiro, Mauricio Veloso Brant-
Autor(es): dc.creatorCipriano, Ricardo Augusto Scholz-
Autor(es): dc.creatorKarfunkel, Joachim-
Autor(es): dc.creatorChaves, Mario Luiz de Sá Carneiro-
Autor(es): dc.creatorKrambrock, Klaus Wilhelm Heinrich-
Data de aceite: dc.date.accessioned2025-08-21T15:12:11Z-
Data de disponibilização: dc.date.available2025-08-21T15:12:11Z-
Data de envio: dc.date.issued2022-09-14-
Data de envio: dc.date.issued2022-09-14-
Data de envio: dc.date.issued2020-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/jspui/handle/123456789/15279-
Fonte completa do material: dc.identifierhttps://link.springer.com/article/10.1007/s00269-021-01159-1-
Fonte completa do material: dc.identifierhttps://doi.org/10.1007/s00269-021-01159-1-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1005636-
Descrição: dc.descriptionThe origin of gamma irradiation-induced strong yellow color in brazilianite from Brazil is investigated. The irradiation- induced optical absorption band responsible for the color shows an onset in the blue spectral region at about 2.5 eV and maximum centered in the UV at ~ 4.24 eV. From the ratio between the squared value of the line width (W2 ) and the peak energy (M), a value of about 0.09 eV is estimated, which is consistent with an absorption band caused by a Schirmer ́s-type O− bound small polaron. By electron paramagnetic resonance (EPR), we are able to confrm its microscopic structure. This O− hole center is in fact the Al3+–O−X2+–P5+ hole center already identifed by EPR earlier in the literature (where X2+ stands for a nearby divalent cation with negligible abundance of magnetic isotopes). The EPR spectrum of the Al3+–O−X2+–P5+ hole center, along with the O− bound small polaron absorption band responsible for the yellow color, appears simultane- ously at high concentrations after gamma irradiation, and vanishes together for thermal annealing above 300 °C, returning after re-irradiation in a reversible way. Their appearance is concomitant with the H0 centers and Ti3+ electron centers, and possible charge-compensating centers.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectBrazilianite-
Palavras-chave: dc.subjectElectron paramagnetic resonance-
Palavras-chave: dc.subjectIrradiation-
Palavras-chave: dc.subjectElectron–hole center-
Palavras-chave: dc.subjectO− hole center-
Título: dc.titleOn the yellow color of gamma‐irradiated brazilianite from Minas Gerais (Brazil).-
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