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The D 0 5 → 7 F 0 , 7 F 1 , 7 F 2 emissions of europium(III) in a glass (sodium aluminosilicate), sphene ceramic calcium titanosilicate ( CaTiSiO 5 ), and glass ceramic (microcrystalline sphene in a sodium aluminosilicate glass matrix) are reported. Fluorescence-line-narrowed emission excited by the D 0 5 ← 7 F 0 transition was used to sample the different coordination sites of Eu 3 + represented by the inhomogeneously broadened absorption band. From the ratios of crystal-field parameters of the same order ( B 22 / B 20 and B 44 / B 40 ) obtained from fitting the observed energy levels assuming C 2 v site symmetry, it was found that the sites Eu 3 + occupies in the glass are adequately described by Brecher and Riseberg’s model of a ninth coordinating oxygen atom approaching a distorted Archimedian antiprism of oxygen atoms along the C 2 axis. At least two different coordination sites exist in the sphene ceramic, neither of which fits the above coordination scheme, but at least the geometrical coordination appears constant. Emission from Eu 3 + in both the glass and sphene phases was observed from the glass-ceramic samples. Furthermore, a Eu 3 + partitioning ratio of 8:1 (sphene phase to glass phase) is estimated from the ratios of integrated emission intensities.
Physical Review B – American Physical Society (APS)
Published: Sep 15, 1986
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