选用能量为0.1～500 MeV、总注量为1.0×10~(18) neutron/cm~2的快中子对α-Al_2O_3单晶进行辐照.采用吸收光谱和荧光光谱研究了α-Al_2O_3单晶经辐照后的缺陷形成及光学性能变化.α-Al_2O_3单晶经快中子辐照后出现着色现象,在206、228及256 nm等处出现吸收峰.荧光光谱出现了326、331及379 nm等荧光吸收峰值.分析表明,中子辐照在α-Al_2O_3单晶中产生了F~+、F_2及F_3~+等色心类型,该类吸收色心起源于α-Al_2O_3单晶中氧空位,并计算了辐照退火前后的色心浓度N.正电子湮没寿命结果表明,经快中子辐照后,α-Al_2O_3单晶产生单空位及多空位,且多空位浓度增大幅度比单空位的增大幅度大.
The fast neutron with the energy of 0.1～500 MeV and the dose with 1.0×10~(18) neutron/cm~2 was chosen to irradiate α-Al_2O_3 single crystal. The formation of defects and the change of optical property were studied by absorption and luminescence spectra. The results showed that α-Al_2O_3 single crystal was colored up by the irradiation of neutron and there were absorption peaks at 206, 228 and 256 nm, etc. There were also luminescence peaks at 326, 331 and 379 nm, etc. It was founded that there were many color centers, such as F~+, F_2, F_3~+ color centers, in α-Al_2O_3 single crystal after neutron irradiation. The study indicated that the color center was due to the origin of oxygen vacancy. The concentration N of color centers were calculated. The result of PAT indicated that there were vacancies in α-Al_2O_3 single crystal after neutron irradiation and the increase of single-vacancy was greater than that of multiple-vacancy.
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