Radiation induced color centers in silica glasses of different OH content
Radiation induced color centers in silica glasses of different OH content
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DOI：
10.1016/j.nimb.2014.03.011
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发表时间：
2014-07-01
影响因子：
1.3
通讯作者：
Li, Jiacheng
中科院分区：
文献类型：
--
作者：
Fu, Xinjie;Song, Lixin;Li, Jiacheng
本文研究了不同OH含量的高纯石英玻璃中γ辐射诱发的色心。用1000 kGy γ射线辐照玻璃后，进行了紫外-可见吸收光谱、电子顺磁共振和傅里叶变换红外光谱的测量。结果表明，在所有样品中均诱导出E'心（Si）、氧缺陷心（Si-Si）和B1心，而非桥氧空穴心（Si-O-心点）和铝氧空穴心（Al-O-心点）仅在低OH JGS 3和中OH JGS 2中出现。高羟基JGS 1中各色心的浓度低于JGS 2和JGS 3。研究发现，玻璃中OH的含量与诱导色心的类型和浓度密切相关。通过与羟基光解释放的氢原子复合，色心E'中心、非桥氧空穴中心和铝氧空穴中心可转化为Si-H、氢键Si-OH和Al-OH等可见无色基团，这很好地解释了OH对辐射显色的抑制作用。(C)2014爱思唯尔有限公司版权所有。
Color centers induced by gamma radiation in high-purity silica glasses with various OH contents were investigated in this work. Several measurements, UV-Vis absorption spectra, electron paramagnetic resonance and Fourier Transform Infrared spectra were performed after the glasses being irradiated by 1000 kGy gamma rays. The results show that E' centers ( Si), oxygen deficient centers ( Si-Si ) and B1 centers are induced in all samples, while non-bridging oxygen hole centers ( Si-O-center dot) and aluminum-oxygen hole centers ( Al-O-center dot) appear only in low-OH JGS3 and medium-OH JGS2. The concentration of each color centers in high-OH JGS1 is lower than that in JGS2 and JGS3. It is found that different type and concentration of induced color centers are closely depending on the amount of the OH in the glasses. Through the recombination with atomic hydrogen released by photolysis of hydroxyl, the color centers named E' center, non-bridging oxygen hole centers and aluminum-oxygen hole centers, could be transformed into visible colorless groups such as Si-H, H-bond Si-OH and Al-OH, which could be a good explanation for the suppressing effect of OH on the radiation coloration. (C) 2014 Elsevier B.V. All rights reserved.