Abstract
ß-BaB2O4 (BBO) has been considered to be an excellent non-linear optical material in single crystal form; however, BaO·B2O3 can also form a glass. BaO·B2O3 glass has a density of about 3.9 g/cm3, a glass transition around 525°C, an onset of crystallization around 560°C, a maximum crystallization at 585°C and a refractive index of 1.59. Optically transparent BaO·B2O3 glass-ceramics have been successfully prepared by controlled crystallization. Formation of submicrometer, spherical crystallites of ß-BaB2O4 within the glass was verified by X-ray diffraction and scanning electron microscopy. These glass-ceramics exhibit a UV cutoff at 220 nm, a refractive index of 1.61 and second harmonic generation efficiency 0.01–0.12 times that of urea.
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