Effect of Tungsten Oxide on the Crystallization Properties of Glasses of the B2O3–La2O3–Nb2O5 System

The effect of tungsten oxide on the crystallization properties of glasses of the 37.5B2O3 22.5La2O3 (40 – x)Nb2O5 xWO3 (where x = 10, 15, 20, 30, 40 mol %) system when replacing them with niobium pentoxide is studied. It is established that during the crystallization of glasses containing niobium and tungsten, the parallel precipitation of crystalline phases of complex LaxNbyAlzWnOm tungstates and LaNbWAlBO borates of a variable chemical composition is observed.