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Type: Artigo de periódico
Title: Study on the observation of Eu2+ and Eu3+ valence states in low silica calcium aluminosilicate glasses
Author: Sampaio, JA
Filadelpho, MC
Andrade, AA
Rohling, JH
Medina, AN
Bento, AC
da Silva, LM
Gandra, FCG
Nunes, LAO
Baesso, ML
Abstract: The optical, magnetic and structural properties of Eu doped low silica calcium aluminosilicate glasses were investigated. The optical absorption coefficient presented two bands at 39 246 and 29 416 cm(-1), which were assigned respectively to the 4f(7) (S-8(7/2)) -> 4f(6) (4F(J)) 5d (T-2g), and 4f(7) (S-8(7/2)) -> 4f(6) (4F(J)) 5d (E-g) transitions of Eu2+. The fluorescence measured at 300 K on a sample doped with 0.5 wt% of Eu2O3 exhibited a broad band centered at 17 350 cm(-1), which is attributed to the 4f(6)5d -> 4f(7) transition of Eu2+, whereas the additional peaks are due to the D-5(0) -> F-7(J) (J = 1, 2, 4) transitions of Eu3+. From magnetization and XANES data it was possible to evaluate the fractions of Eu2+ and Eu3+ for the sample doped with 0.5 and 5.0 wt% of Eu2O3, the values of which were approximately 30 and 70%, respectively.
Country: Inglaterra
Editor: Iop Publishing Ltd
Citation: Journal Of Physics-condensed Matter. Iop Publishing Ltd, v. 22, n. 5, 2010.
Rights: fechado
Identifier DOI: 10.1088/0953-8984/22/5/055601
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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