论文信息 - Coordination change of Te atoms in binary tellurite glasses

Coordination change of Te atoms in binary tellurite glasses

Coordination changes of Te(+ IV) atoms were derived from Raman and X-ray photoelectron spectra of the binary tellurite glasses containing Li, Na, Ba and Zn. A structure model consistent with the experimental results was proposed. In this model, TeO4 units were converted mainly to O22Te=O and O12Te(=O) O− in the range of lower atomic ratio O/Te, and the rate of increase of TeO3/TeO4 decreased in the range of higher O/Te because of the equilibrium TeO42 ↔ O22TeO. The increase in the fraction of non-bridging oxygen atoms and three-coordinated Te(+ IV) atoms was confirmed by X-ray photoelectron spectra. The fraction of non-bridging oxygen estimated from X-ray photoelectron spectra agreed well with that from the Raman spectra and the model.

[1] T. Sekiya,et al. Normal Vibrations of Two Polymorphic forms of TeO2 Crystals and Assignments of Raman Peaks of Pure TeO2 Glass , 1989 .

[2] T. Sekiya,et al. Raman spectra of MO1/2TeO2 (M = Li, Na, K, Rb, Cs and Tl) glasses , 1992 .

[3] Y. Dimitriev,et al. Infrared spectral investigation of the influence of modifying oxides on the structure of tellurite glasses , 1989 .

[4] B. Mysen,et al. Curve-fitting of Raman spectra of silicate glasses , 1982 .

[5] H. Beyer. Verfeinerung der Kristallstruktur von Tellurit, dem rhombischen TeO2 , 1967 .

[6] S. Gronowitz,et al. Refinement of the Structure of alpha-TeO2. , 1968 .

[7] Katsuhisa Tanaka,et al. Glass-forming region and structure of oxyhalide tellurite glasses containing LiX (X=F and Br) and Li2O , 1989 .

[8] G. Sigel,et al. Spectroscopic Analysis of the Structure and Properties of Alkali Tellurite Glasses , 1992 .