掺Yb硅酸盐玻璃的热漂白性能研究  

Performance of Yb-doped silicate glass with thermal bleaching

作　　者：熊中龙 吴妍[1] 景锐平[1] 马冲[1] 龙蔚辉 张超军[1] 程永进[1] 

机构地区：[1]中国地质大学(武汉)数学与物理学院,武汉430074

出　　处：《物理学报》2016年第4期125-130,共6页Acta Physica Sinica

基　　金：中国地质大学(武汉)新青年教师科研启动基金(批准号:007-G1323511558)资助的课题~~

摘　　要：采用传统高温熔融法制备了掺Yb硅酸盐玻璃,玻璃组成为60SiO_2-12Al_2O_3-28CaO-1.0 mol%Yb_2O_3.将玻璃分成两组,一组经总剂量3 kGy的^(60)Co γ辐射源辐射,另一组做空白对照.然后测试了玻璃未辐射、辐射后及热漂白后的吸收谱和近红外发光谱.实验结果表明:一定的热处理会使得玻璃在辐射过程中产生的色心缺陷发生分解,即辐射后的玻璃在300—900 nm波段的吸收系数显著地降低了,在400 nm处未经辐射、经3 kGy辐射以及热漂白后的玻璃吸收系数分别是0.93,2.9,1.89 cm^(-1);另外,玻璃的近红外发光强度明显增强,在1028 nm处未经辐射、经3 kGy辐射以及热漂白后的玻璃近红外发光相对强度分别是588,261,436,从而极大地改善了玻璃的光学性能.所以一定的热处理可以使辐射后的玻璃产生热漂白的现象.研究结果为进一步发展抗辐射玻璃材料提供了新的实验依据.A series of Yb-doped silicate glasses with the composition by a conventional melting method under normal processing of 60SiO2-12Al2O3-28CaO-1.0 mol%Yb203 are prepared conditions. These glasses are divided into two groups. One group experienced a total dose 3 kGy radiation under a 60Co γ radiation source, and the other group is pristine. The absorption spectra as well as the near-infrared （NIR） luminescence spectra of the glasses （pristine Ybc, irradiated Ybc, heat bleaching Ybc） are investigated. Theoretically, effects of gamma-ray radiation exposure would lead to the formation of color centers in the glass samples. Such radiation-induced color center defects cause a strong broad optical absorption band with widths from 300 to 900 nm, and its tail extends into the NIR region. In this experiment the absorption coefficient of the glass is measured by a ultraviolet-visible spectrophotometer named Lambda35, and the NIR spectrum is measured by a Zolix grating spectrometer named Omni-λ. Furthermore, a special test system is set up to test the NIR spectrum of the glass at high temperatures. Experimental results show that the absorption coefficient of the glass after irradiation increases significantly in the visible region. The absorption coefficients of the glasses （pristine Ybc, irradiated Ybc） at 400 nm are 0.93 cm-1 and 2.9 cm-1 respectively. With a certain temperature treatment, the absorption coefficient of the irradiated glass is 1.89 cm-1 at before, it is decreased by 35%. The NIR intensities of the 400 nm. Compared with the absorption coefficient obtained glasses （pristine Ybc, irradiated Ybc, heat bleaching Ybc） are 588, 261 and 436 （arbitrary units） respectively. It may be due to the color center defects produced by radiation, that have decomposed under a certain temperature treatment. As a result, this method greatly improve the optical performance of the glass. So thermal bleaching phenomenon will happen in the irradiated glass that experiences in a certain temperature treatment. Final

关 键 词：掺Yb硅酸盐玻璃 近红外发光 吸收系数 热漂白 

分 类 号：TQ171.1[化学工程—玻璃工业]