Hyperfine interactions at europium sites in oxide glasses

被引:21
|
作者
Concas, G
Congiu, F
Muntoni, C
Bettinelli, M
Speghini, A
机构
[1] UNITA IST NAZL FIS MAT CAGLIARI,I-09124 CAGLIARI,ITALY
[2] UNIV VERONA,FAC SCI MATEMAT FIS & NAT,IST POLICATTEDRA,SEZ CHIM,I-37134 VERONA,ITALY
来源
PHYSICAL REVIEW B | 1996年 / 53卷 / 10期
关键词
D O I
10.1103/PhysRevB.53.6197
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The shape of the gamma resonance absorption peak of the Eu3+ ion in a disordered structure was investigated in some phosphate, berate, and silicate glasses by using Eu-151 Mossbauer spectroscopy. The quality of the fits was tested by using the Durbin-Watson d statistics. The observed full width at half maximum of the peak was resolved in a contribution of the broadening and a contribution of the quadrupole splitting, due to the distortion of the Eu site compared to a cubic symmetry. The Eu-O bond was found to have a covalent admixture with 6s character. The axial component of the electric-field gradient at the Eu site was found to be correlated with the optical basicity of the glass.
引用
收藏
页码:6197 / 6202
页数:6
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