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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|
da Silva, LM
|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.|
|Editor:||Iop Publishing Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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