Investigation on Fluoroaluminate Glasses Containing

Varying contents of ZrF4 were incorporated into the fluoroaluminate base-glass having a composition of 10MgF2- 20CaF2-10SrF2-BaF2-15YF3-35AlF3(molar percent), contents of other components being adjusted properly, fluoride glasses having no visible crystallization were obtained, these glasses can reach to 8mm thick. The content influences of ZrF4 on the ability to form glass and kinetics of crystallization were investigated by differential thermal analysis (DTA) technique. The results indicate that a small amount of ZrF4 will improve the anti-devitrification ability of glasses, but too much ZrF4 maybe depress the ability to form glass. The best content range of ZrF4 is from 7.3% to 11.4%. Moreover, the measured infrared transmitting spectra prove that these glasses have good optical property of infrared transmitting.