摘要
采用传统熔融淬冷法制备了5组高Bi2O3含量的Bi2O3-B2O3-Ga2O3系统玻璃样品。测试了玻璃样品的密度,折射率和吸收光谱。利用经典的Tauc方程计算了样品的间接允许光学带隙Eopgi,直接允许光学带隙Eopgd和Urbach能量ΔE。根据Duffy等人提出的经验推导公式计算了样品的能量带隙Eg。研究了Ga2O3含量对玻璃样品的密度、折射率、摩尔折射度Rm、金属标准值Mm、光学带隙、能量带隙和Urbach能量的影响,并分析了它们之间的关系。结果表明:随着Ga2O3含量的增加,玻璃样品的密度和折射率逐渐增大,但Ga3+对玻璃折射率的影响要小于B3+;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∶1.1;Urbach能量逐渐减小,即玻璃中带裂变和缺陷形成的趋势越小。
A series of glasses with high Bi2O3 content of Bi2O3-B2O3-Ga2O3 ternary system were chosen and prepared by the conventional melt quenching methods. The densities, refractive indexes and absorption spectra of samples were measured. Energy band gap （ Es ）, Urbach energy （AE） , indirect and direct allowed optical band gaps of samples were calculated accordlng to Duffy and Tauc equation. The relationships between them and Ga2O3 content were discussed. It was found that the refractive index of samples as well as the ultraviolet absorption increased with increasing of Ga2O3 content, but the effect of Ga3＋ on the refractive index was much lower than that of B3＋. Urbach energy, optical band gap and energy band gap decreased with increasing of Ga3＋ , and the ratio of optical band gap to energy band gap was about 1： 1.1. These results indicate that the increase of Ga2O3 content in glasses can contributes to improve the third-order nonlinear susceptibility.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2010年第2期340-344,351,共6页
Bulletin of the Chinese Ceramic Society
