Sb对GeSb_xSe_(7-x)硫系玻璃的结构和物性的影响

Effect of Sb on Structure and Physical Properties of Ge Sb_xSe_(7-x) Chalcogenide Glasses

采用熔融–淬冷法制备了GeSbxSe7-x(x=0.4、0.8、1.2、1.6、2.0)系列硫系玻璃,并系统地研究了Sb对玻璃结构和物理性能的影响。拉曼光谱测试结果显示,随着Sb含量增加,玻璃结构逐渐从由Se链或Se环主导转变为由交联的SbSe3/2三角锥结构单元和GeSe4/2四面体结构单元主导,玻璃网络交联程度增加。同时,玻璃的转变温度、密度、弹性模量和折射率都随着Sb含量的增加而增大。透过光谱研究表明,随着Sb逐渐替换Se原子,光学带隙逐步减小。

Ge SbxSe7-x（x = 0.4, 0.8, 1.2, 1.6, 2.0） chalcogenide glasses were prepared by the melt-quenching technique, and the effect of Sb on glass structures and physical properties were systematically investigated. Raman spectra of these glasses show that the glass structure gradually changes from Se chains or Se rings dominated to Sb Se3/2 pyramids and Ge Se4/2 tetrahedra cross-linked, and the degree of cross-linkage of glass network improves with Sb content increase. Meanwhile, the glass transition temperature, density, elastic moduli, and refractive index increase with Sb content increase. The transmittance spectra indicate that replacement of Se with Sb leads to gradually reducing the optical bandgap.