Portal de Periódicos da CAPES

EXAFS of germanium in glasses of the GeO2TeO2 system

1995; Elsevier BV; Volume: 191; Issue: 3 Linguagem: Inglês

10.1016/0022-3093(95)00317-7

1873-4812

Akiyoshi Osaka, Jianrong Qiu, Yoshinari Miura, Takeshi Yao,

Luminescence Properties of Advanced Materials

Extended X-ray absorption fine structure (EXAFS) near the Ge K-edge in glasses of the GeO2TeO2 system was measured. The results were analyzed with both the GeO4GeO6 two-shell model and the GeO4 single-shell model. Since the two-shell model gave a better fit of the measured EXAFS it was concluded that the germanate anomaly should be interpreted by the convention, namely, the formation of GeO6 units. The fraction of the GeO6 units decreased from 0.46 to 0.266 as the GeO2 content increased from 12 to 68 mol%.