Preparation and Properties of Transparent Glass-Ceramics in x K 2 O-(33.3- x )BaO-16.7TiO 2 -50SiO 2 Glasses.

Transparent surface crystallized glasses have been prepared by controlled heat treatment in the system xK 2 O-(33.3-x) BaO-16.7TiO 2 -50SiO 2 (0 = x = 20 mol%), and properties were investigated. The glassy nature was analyzed by differential thermal analyses. The transparency of glass-ceramics is variable and controllable by the processing parameters like time and temperature. The c-axis orientation of surface crystallized Ba 2 TiSi 2 O 8 was observed at the bulk glass-ceramics surfaces and characterized the diffraction intensity ratio (002)/I(001). The estimated nonlinear optical susceptibility ? (3) is discussed in relation to the optical parameters. [ABSTRACT FROM AUTHOR]