Raman Spectrum and Thermal Stability of a Newly Developed TeO_2-BaO-BaF_2-La_2O_3-LaF_3 Glass

作     者：Junjie ZHANG, Shixun DAI, Shiqing XU, Guonian WANG, Liyan ZHANG and Lili HUShanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P. O. Box 800-211, Shanghai 201800, China 

作者机构：Inst. of Optics and Fine Mech. Chinese Acad. of Sci. P.O. Box 800-211 Shanghai 201800 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2004年第20卷第5期

页      面：527-530页

核心收录：

学科分类：07[理学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 070302[理学-分析化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：This work was supported by the National Natural Science Foundation of China under grant No.60207006 the Optical Science and Technology of Shanghai under grant No.022261046 "Qiningxing”Projert(No.04QMX1448)of Shanghai Municipal Science and Technology Conmission. 

主　　题：Raman spectrum Thermal stability Oxyfluorotellurite 

摘      要：In this work, a new TeO2-BaO-BaF2-La2O3-LaF3 oxyfluorotellurite glass system is investigated. Differential thermal analysis (DTA) and structural analysis by Raman scattering spectra are reported on the glasses. The DTA results indicated that an increase of fluoride content in the glasses decreases the glass transition temperature (Tg) and increases the crystallization onset temperature (Tx). As a result the 70TeO2·20BaF2·10LaF3 glass showed a large Hruby s parameter, possessing excellent thermal stability. Changes in glass network structure with fluoride content are discussed based on the Raman scattering spectra of glasses. The glass network structures in the 70TeO2·4(20-x)BaO·xBaF2·(10-y)La2O3·yaF3 glasses are basically composed of both Te(O, F)4 and Te(O, F)3 units, but the Te(O, F)4/Te(O, F)3 ratio in the glass becomes higher with increasing fluoride content. This may be considered one of the reasons why the 70TeO2·20BaF2·10LaF3 glass exhibits excellent thermal stability.