Abstract
The fresnoite phase, one of the crystals obtainable in the BaO-TiO₂-SiO₂ (BTS) system, is a material with excellent nonlinear optical properties. In this study, glass-ceramic containing nanometer scale fresnoite crystal was prepared by controlling the heat-treatment process from a BTS system, and its properties were analyzed. BTS glasses were prepared by conventional melting and quenching method. The heat treatment conditions were investigated by the non-isothermal analysis method using DTA. The formation of fresnoite crystals and the change of crystallinity according to heat treatment temperature were investigated by a XRD analysis. The glass-ceramics prepared in this study had fine crystal grains less than 100 nm in size and showed surface crystallization behavior growing from the surface to the inside. The transmittance of the prepared specimen in the range of visible light was measured up to 77%. The photoluminescence (PL) intensity of specimen was remarkably high at 470 nm and the emitted light has a blue and white light characteristic as displayed in the CIE coordinates.
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