光子功能材料与器件研究室知识库

The glass powder with a relatively complicated composition of 64.02SiO(2)-10.05B(2)O(3)-7.84Na(2)O-14.07ZnO-4.02Al(2)O(3) (in wt.%) was first synthesized via sol-gel route. The optimal synthesis conditions for the amorphous gel are obtained. The glass transition temperature (T-g) of xerogel was detected as 552 degrees C and the glass network structure formed by the [SiO4], [BO4] and [AlO4] units were confirmed by the Fourier Transform-Infrared Spectroscopy (FT-IR). The phase structure and morphologies of glass powder were characterized by X-ray diffractometer (XRD) and Field Emission-Scanning Electron Microscope (FE-SEM), the xerogels and sol-gel glasses exhibit amorphous phase when the heat-treatment temperature increases from 300 degrees C to 700 degrees C. The prepared glass powder with high specific surface areas and a large amount of pores contribute to the synthesis of a composite of glass-mullite-beta-eucryptite at a relatively low sintering temperature of 800 degrees C, which present a relatively low coefficient of thermal expansion (CTE) and high mechanical strength.