IR and Raman spectroscopic studies of sol�?�gel derived alkaline-earth silicate glasses

Bulletin of materials science

Angelos G Kalampounias¹ 

[1] Department of Chemical Engineering, University of Patras, GR â€�?? 26 504, Patras, Greece; and Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, GR â€�?? 26 504, Patras, Greece$$Department of Chemical Engineering, University of Patras, GR â€�?? 26 504, Patras, Greece; and Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, GR â€�?? 26 504, Patras, GreeceDepartment of Chemical Engineering, University of Patras, GR â€�?? 26 504, Patras, Greece; and Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, GR â€�?? 26 504, Patras, Greece$$

关键词: Solâ€�?�gel silicate glasses;    Raman spectroscopy;    IR spectroscopy;    structure;    silicates.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

IR and Raman spectroscopies have been utilized to study the structure and vibrational modes of solâ€�?�gel-derived binary silicate glasses. The present study is motivated by the immense geological significance and focuses on the MOâ€�?�SiO₂ (M = Ca, Mg) binary systems in an effort to unveil the role of the CaO and MgO modifiers when incorporated to the 3D silica structure. Glasses in the composition range ð‘�? = 0, 0.1, 0.2, 0.3 and 0.4 prepared by the solâ€�?�gel method were compared with the corresponding glasses formed by appropriate mixing of SiO₂ and MO powders through melting and fast cooling. The vibrational spectra of the solâ€�?�gel-derived glasses have revealed considerable changes in relative intensities as a function of the MO mole fraction. These changes signify structural modifications on the silica network. The population of the ð‘�??³ species was found to increase for both modified silicate systems. The rate of increase is more pronounced in the CaOâ€�?�SiO₂ glasses. The extent of network depolymerization in the porous glass is higher at the same content of alkaline earth oxide compared to the bulk glass. The results are indicative of a more `defective’ nature of the solâ€�?�gel glasses compared to the corresponding melt-quenched ones.

【 授权许可】

Unknown