Bi_4Si_3O_(12)基玻璃陶瓷的制备及热处理对其光学性能的影响

Preparation of Bi_4Si_3O_(12)-based Glass-ceramics and Effect of Heat Treatments on Their Optical Properties

采用阶梯热处理的方式对Bi2O3-SiO2基玻璃进行析晶处理，得到了具有不同结晶率和透明度的Bi4Si3O12（BSO）基玻璃陶瓷。实验表明，分段热处理有利于控制BSO基玻璃陶瓷中晶粒的数量和尺寸，从而影响玻璃陶瓷的透明度和发光性质。分段热处理后样品的透射谱显示，BSO基玻璃陶瓷（在600℃保温1h，然后升温至8000C保温1h）的透过率可达73．1％（λ〉500nm）。制备出的BSO基玻璃陶瓷具有和BSO单晶相似的发光性质，在可见光波段（380-680nm）有发光，且发光强度与结晶率成正比。低温（14K）下，该BSO基玻璃陶瓷的发光强度较室温下提高了约12倍。

Bi4Si3O12-based glass-ceramics with different crystalline volume fractions and transparency were prepared by the two-step heat-treatment of Bi2O3-SiO2 based glass. The experimental results show that the two-step heat-treatment is favorable to control the amount and size of crystallized grains in BSO-based glass-ceramics, which correspondingly affects the transparency and optical properties of the obtained glass-ceramics. The transmission spec- tra of these samples indicate that the transparency of B SO-based glass-ceramic （annealed at 600~C for 1 h, then heated to 800~C and held for 1 h） can reach 73.1% （〉 500 nm）. The BSO-based glass-ceramics maintain similar optical prop- erty as that of BSO single crystal, that is, the emission of such glass-ceramics is located in visible light wavelength of 380-680 nm, and their optical intensities are almost proportional to the crystalline volume fraction. The optical intensity of BSO-based glass-ceramic at low temperature （14 K） is increased by 12 times as against that at room temperature.