Abstract: 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.

Key words: fluoride glass, differential thermal analysis, glass formation, crystallization kinetics