MgAl_2O_4透明陶瓷中电子辐照诱导缺陷退火行为研究

Behavior of defects in the electron-irradiated transparent MgAl_2O_4 ceramics after annealing

用能量为１．７ＭｅＶ，束流强度０．７μＡ·ｃｍ－２，总注量６．３×１０１６ｃｍ－２的电子辐照镁铝尖晶石透明陶瓷，并对辐照后的样品进行等时退火，利用ＵＶＶＩＳ和ＰＡＴ测试，表明通过电子辐照样品在２３７ｎｍ和３７０ｎｍ处产生吸收带，它们主要是Ｆ心及Ｖ型色心。通过退火可以使Ｆ心及Ｖ型色心吸收峰消除，但Ｆ心的消除温度要高于Ｖ型色心，且其在退火过程中形成Ｆ聚心，Ｆ聚心随Ｆ心聚集增加其峰位将向紫外移动。

Transparent MgAl2O4 ceramics was exposed to electrons beam with the energy of 1.7MeV and the flux of 6.3×1016cm-2. The samples have been isochronally annealed after irradiation. The optical spectra and the defects have been measured by UV VIS and PAT. The experiments indicated that two kinds of optical-absorptions at 237nm and 370nm were introduced for electron irradiatied MgAl2O4 ceramics, which were resulted from V-type absorption and F center. All the color centers can be drown by annealing. In the process of annealing, the F center converted into F2, F3, F4 center, and the optical-absorption band at 237nm moved to 210nm.