TeO_2-TiO_2-Bi_2O_3系统玻璃的热学特性及光学带隙研究  

Thermal Characteristics and Optical Band Gap Properties of TeO_2-TiO_2-Bi_2O_3 Glasses

作　　者：王艳玲[1] 戴世勋[1] 徐铁峰[1] 聂秋华[1] 沈祥[1] 王训四[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《光学学报》2008年第9期1751-1756,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60677015);宁波市自然科学基金(2006A610020);浙江省教育厅资助课题(20061664);宁波大学王宽诚幸福基金资助课题

摘　　要：采用熔融淬冷法制备了系列高折射率的TeO2-TiO2-Bi2O3系统玻璃,测试了样品的密度、转变温度、析晶温度、折射率、吸收光谱,利用经典的Tauc方程计算了样品光学带隙允许的直接跃迁、允许的间接跃迁及Urbach能量。讨论了玻璃的热稳定性与组成之间的关系、研究了摩尔折射度、金属标准值、光学带隙、Urbach能量、Bi2O3和TiO2含量及光学碱度对玻璃样品折射率的影响。结果表明TeO2-TiO2-Bi2O3玻璃具有较好的热稳定性、样品的折射率随着摩尔折射度增大而增大,而光学带隙及金属标准值有减小的趋势,此外高的光学碱度对玻璃的高的三阶非线性也有一定的贡献。A series of TeO2-TiO2-Bi2O3 glasses were prepared by using conventional melting and quenching method. Their densities, transition temperatures, crystallization temperatures, refractive indices, absorption spectra were measured. The allowed direct transition and indirect transition, and Urbach energy of samples were calculated according to classical Tauc equation. The relationships between thermal stability and glass compositions were discussed. The effects of molar refraction, metallization criterion, optical band gap, Urbach energy, contents of TiO2 and Bi2O3, and optical basicity on refractive indices of glass samples were also discussed . The results show that the TeO2-TiO2-Bi2O3 glass system has good stability. With the increase of molar refraction the refractive index increases, optical band gap and metallization criterion shrink. Meanwhile, the high third-order non linearity is associated with high optical basicity.

关 键 词：光学材料 碲酸盐玻璃 折射率 光学带隙 能量带隙 

分 类 号：O482.2[理学—固体物理] O433.51[理学—物理]