Bi_2O_3-B_2O_3-BaO系玻璃的光学折射率与带隙

REFRACTIVE INDEX AND BAND GAP OF Bi_2O_3–B_2O_3–BaO GLASSES

研究了Bi2O3–B2O3–BaO三元系统的玻璃形成区,给出了该三元系统玻璃形成范围。采用熔融淬冷法制备了60Bi2O3–(40–x)B2O3–xBaO(x=5,10,15,20)和65Bi2O3–25B2O3–10BaO(以摩尔计)的5组高Bi2O3含量的Bi2O3–B2O3–BaO玻璃样品。测试了玻璃样品的折射率和吸收光谱,根据经典的Tauc方程计算了间接允许光学带隙和直接允许光学带隙,计算了样品的能量带隙,并估算了它们之间的关系。研究结果表明:随着BaO含量的增加,玻璃样品折射率逐渐增大,但Ba2+对玻璃折射率的影响要远小于Bi3+;玻璃样品的紫外吸收增强,光学带隙和能量带隙逐渐减小,光学带隙和能量带隙的比值约为1:1.2。

The formation range of the Bi2O3–B2O3–BaO system glasses was investigated. Five samples of 60Bi2O3–(40–x)B2O3–xBaO (x=5, 10, 15, 20), 65Bi2O3–25B2O3–10BaO(in mole), containing high Bi2O3 content were chosen and prepared using the conventional melting and quenching meld methods. The refractive indexes and the absorption spectra of the samples were measured, and the en- ergy band gap and the indirect and direct allowed optical band gaps of the samples were calculated according to the Tauc equation, and the re...