阳离子对硅酸盐玻璃激光拉曼光谱影响的研究  

Influence of Cations on the Laser Raman Spectra of Silicate Glasses

作　　者：熊义[1] 赵虹霞[1] 干福熹[1,2] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800 [2]复旦大学,上海200433

出　　处：《光谱学与光谱分析》2012年第4期997-1001,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(51072206)资助

摘　　要：运用拉曼光谱技术研究了Na2O(K2O)—CaO(MgO)—SiO2,Na2O(K2O)—Al2O3—SiO2,Na2O(K2O)—B2O3—SiO2,Na2O(K2O)—PbO—SiO2和PbO—BaO—SiO2五个系统的玻璃。结果表明,阳离子对玻璃近程结构的改造会引起拉曼特征的变化。部分样品是根据古玻璃平均成分在实验室烧制的,这项研究对于运用激光拉曼光谱区分不同系统的古代硅酸盐玻璃有重要意义。Na20（K20） CaO（MgO） SiO2, Na20（K2O） A12O3 SiO2, Na20（K20）-B2Oa SiO2, Na2O（K2O） PbO SiO2and PbO-BaO-SiO2 glass systems were investigated using laser Rarnan spectroscopic technique. The modification of short-range structure of glass caused by network modifier cations will influence Raman signature. Alkali and alkali-earth ions can weaken the bridging oxygen bond, thus lower the frequency of Si-Ob--Si anti-symmetric stretching vibratior When coordinated by oxygen ions, W＋ can form [BO4 ]tetrahedron and enter the silicon-oxygen network, but this effect had little impact on the frequency of Raman peaks located in the high-frequency region. AP＋ can also be coordinated by oxygen ions to form [ALO4] tetrahedron. [A1O4] will increase the disorder degree of network while entering network. Ba2＋ can increase the density of elec tron cloud along the Si Onb bond when it bonds with non-bridging oxygen, which will lead to a higher peak intensity of O Si Ostretching vibration. The Raman peaks of alkli- and alkali-earth silicate glasses are mainly distributed in the region of 400- 1 200 cm 1 - while in the spectrum of NazO（KzO）--PhO SiOz glass system a 131 em-1 peak existed. The authors assigned it to the Pb-O symmetric stretching vibration. Some of the samples were produced in the laboratory according to the average compositions of ancient glasses, so this research is very significant to discriminating ancient silicate glasses of different systems by Laser Raman spectroscopic technique.

关 键 词：激光拉曼光谱技术 硅酸盐玻璃 阳离子 

分 类 号：O433.4[机械工程—光学工程]