Influences of La2O3 on the structure and properties of 50P2O5-30Sb2O3-10CaO-5Al2O3-5TeO2 low-melting glasses.

The glasses of 50P₂O₅-30Sb₂O₃-10CaO-5Al₂O₃-5TeO₂ + xLa₂O₃ were prepared by conventional melting method. The effects of La₂O₃ on the structure, thermal behavior and water durability of glass were studied. Infrared and Raman spectra show that the incorporation of a small amount of La₂O₃ does not cause a fundamental change in the structure of the phosphate glass network, but can significantly improve the chemical stability with the increase of La₂O₃ content. In addition, with the addition of La₂O₃, a small amount of metaphosphate in the glass was depolymerized and some Q² units were converted into Q¹ units. This series of glass has application prospects in low-temperature sealing. [ABSTRACT FROM AUTHOR]