电子辐照MgAl_2O_4透明陶瓷诱导缺陷退火行为的研究

STUDY OF DEFECTS IN THE ELECTRON-IRRADIATED TRANSPARENT MgAl_2O_4 CERAMICS AFTER ANNEALING

作者用能量为 1.7MeV、束流强度 0 .7μA·cm-2 、总注量 6 .3× 10 16cm-2 的电子 ,辐照处理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 ,经电子辐照处理的样品在2 37nm和 370nm处产生主要是由F心及V型色心引起的吸收带 .通过退火可以消除由F心及V型色心引起的吸收峰 ,但消除F心的消除温度要高于V型色心 ,且在退火过程中形成F聚集心 。

The transprent MgAl 2O 4 ceramics were exposed to electron beam with energy in 1.7MeV and injection capacity in 6.3×10 16 cm -2 ,and were isochronally annealed after irradiation.The optical spectra and the defects of these electron irradiated samples were studied by UV VIS and PAT.The investigation indicats that the electron irradiated MgAl 2O 4 ceramics introduce tow opical absorption bands at 237nm and 370nm,they may be due to V type color center and F center.All these color centers can be destroyed by annealing.