Prabhu Nimitha S, Somashekarappa Hiriyur Mallaiah, Sayyed M I, Osman Hamid, Alamri Sultan, Khandaker Mayeen Uddin, Kamath Sudha D
Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India.
Centre for Application of Radioisotopes and Radiation Technology (CARRT), Mangalore University, Mangalagangothri 574199, India.
Materials (Basel). 2021 Nov 17;14(22):6955. doi: 10.3390/ma14226955.
A Yb-doped borate glass system was examined for the structural and optical modifications after γ-irradiation. Among the studied 10BaO-20ZnO-20LiF-(50-)BO-YbO ( = 0.1, 0.5, 0.7, and 1.0 mol%) glasses, the 10BaO-20ZnO-20LiF-49.9BO-0.1YbO glass showed the highest thermoluminescence intensity, trap density, and trap depth. The glass was irradiated with the optimum γ-dose of 1 kGy towards the analysis of radiation-induced defects. The amorphous nature was preserved before and after irradiation. The glass density slightly increased after irradiation. The structural rearrangement was evident from the Fourier transform infrared spectroscopy by the appearance and disappearance of some bonds after γ-irradiation. The transformation of [BO] units into [BO] units and non-bridging oxygens was deduced. The color of the glass darkened after irradiation and the optical absorption intensity enhanced between 250 and 700 nm. The optical bandgap reduced and Urbach energy increased upon γ-dose exposure. The electron spin resonance of the irradiated glass exhibited two signals at g = 2.0167 and g = 1.9938, corresponding to the non-bridging oxygen hole center and Boron -center, respectively.
对一种掺镱硼酸盐玻璃体系进行了γ辐照后的结构和光学变化研究。在所研究的10BaO-20ZnO-20LiF-(50 - )BO - YbO（ = 0.1、0.5、0.7和1.0 mol%）玻璃中，10BaO-20ZnO-20LiF-49.9BO-0.1YbO玻璃表现出最高的热释光强度、陷阱密度和陷阱深度。为分析辐射诱导缺陷，该玻璃用1 kGy的最佳γ剂量进行辐照。辐照前后玻璃的非晶态性质得以保留。辐照后玻璃密度略有增加。通过傅里叶变换红外光谱法可知，γ辐照后一些化学键的出现和消失表明结构发生了重排。推断出[BO]单元向[BO]单元和非桥氧的转变。辐照后玻璃颜色变深，在250至700 nm之间的光吸收强度增强。γ剂量辐照后，光学带隙减小，乌尔巴赫能量增加。辐照后玻璃的电子自旋共振在g = 2.0167和g = 1.9938处出现两个信号，分别对应非桥氧空穴中心和硼中心。
