硼硅酸盐玻璃的电子辐照效应

在高放废物长期地质处置过程中,作为第一层工程屏障的固化体玻璃会受到持续的电子辐照,研究其电子辐照效应对高放废物的长期安全处置具有重要的意义。在透射电子显微镜(TEM)上对硼硅酸盐玻璃样品进行原位电子辐照实验。在电子束的作用下,两种硼硅酸盐玻璃均很快发生相分离现象,这主要是由于电离作用导致Na的迁移或逃逸引起网络体结构重组的结果。引入简单的结构模型解释了两种不同组分硼硅酸盐玻璃相分离的不同,结果表明,相分离的不同与玻璃组分中Na成分的多少密切相关。

Electron Irradiation Effects of Sodium Borosilicate Glass

As the first layer of engineering barriers, glass will be irradiated by electron in the long-term disposal of high level radioactive waste (HLW). It is significant to study the electron irradiation effects of glass for the safe disposal of HLW. In this paper, the effects induced by electron irradiation were studied in situ by transmission electron microscope (TEM). Under electron beam, the phase separation occurred very soon in both glasses, which was correlated to the network relaxation processes as a consequence of diffusion and desorption of sodium species during electron irradiation. A simple structural model was introduced to explain the difference in separated phase in two different glasses, which indicates that the phase separation induced by electron irradiation is closely related to the sodium contents in the glass sample.