氟锆酸盐玻璃的γ射线辐照效应

Effects of γ-ray irradiation on fluorozirconate glass

用电子顺磁共振谱研究了在液氮温度及在室温下氟锆酸盐玻璃的γ射线辐照效应.实验结果表明,辐照后的玻璃中形成了Zr^(3+)、F_2、F^0及一种俘获氧杂质的空穴中心(标号为U)等缺陷.在低温辐照时,非桥氟的存在是产生F_2^-和F^0缺陷的原因.温度高于400K时,所有缺陷全部消失.常温下经γ射线辐照过的玻璃,在紫外区出现一个吸收峰.辐照对该玻璃的红外透过率影响不大.

The γ-ray irradiation effects on fluorozirconate glass have been studied by means of Electron Spin Resonance spectroscopy (ESR) at liquid-nitrogen temperature and room temperature. The irradiationinducod defects were found to be Zr3+, F0, F2- and a kind of centers assigned as a hole trapped on oxygen impurity (U signal). The presence of non-bridging fluorines is tho reason to cause the defects F0 and F2-, when the irradiation is performed at low temperatures. These defects are unstable, at about 400 K all defects vanish from ESR spectra of this glass. The γ-ray irradiation at room temperature produces a absorption peak within ultraviolet region and almost has no effects on the transmission within infrared region.