Crystallization and Optical Properties of Sr<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>-SrAl<sub>2</sub>O<sub>4</sub> Eutectic Glass

SrO-Al 2 O 3 ceramics has prospective applications due to its photo-luminescence and persistent afterglow properties. Sr 3 Al 2 O 6 -SrAl 2 O 4 eutectic glass was prepared by using the aerodynamic levitator equipped with a CO 2 laser device. The prepared Sr 3 Al 2 O 6 -SrAl 2 O 4 eutectic glass beads were further heat-treated at temperature from 880°C to 980°C. The phase evolution, crystallization behavior, optical transmittance and mechanical properties of the annealed eutectic glass ceramics were investigated. The as-prepared glass is colorless and transparent over a wide range from ultraviolet to near-infrared region, and the average in-line transmittance is over 80% in the range of 260-3200nm. There were two crystal phases Sr 3 Al 2 O 6 and SrAl 2 O 4 crystallized from the glass beads. With increasing heat-treatment temperature, the transparency of the samples decreased, and the hardness increased. The prepared Sr 3 Al 2 O 6 -SrAl 2 O 4 eutectic glass and glass ceramics may be a promising candidate for the development of photo-luminescence and persistent afterglow materials.