INFLUENCE OF LEAD ON THE PROCESSES OF CRYSTALLIZATION AND UV CUTOFF OF FLUOROPHOSPHATE GLASSES DOPED WITH Yb<sup>3+</sup>
Fluorophosphates glasses composition 5Ba(PO3)2-10BaF2-28AlF3-18.5CaF3-10MgF2-18.5SrF2-10YbF3 and 5Ba(PO3)2-10PbF2-28AlF3-18.5CaF3-10MgF2-18.5SrF2-10YbF3 was obtained. Effect of substitution of BaF2 by PbF2 in glass matrix on processes ofcrystallization and UV cutoff was studied.