Preparation and thermal stability of phosphate system protection glasses doped with rare earths

The formation ability and thermal stability of phosphate laser protection glass doped with high Sm₂O₃ content were discussed. The characteristic temperatures (T_g, T_c, T_m) were measured by DSC and the crystallization parameter β was calculated. The results show that the forming regions would shrink and tend to closed ellipse with increasing of Sm₂O₃ content. Increasing of BaO/Al₂O₃ ratio changes the network structure of rare earth glass and improves the thermal stability finally. However, with the increasing of Sm₂O₃ content, the β increases firstly and then decreases, and finally the thermal stability also increases firstly and then decreases.