中子辐照Al_2O_3的缺陷及退火恢复研究  

Radiation Damage and Recovery of Neutron-irradiated Al_2O_3 Crystal

作　　者：马鹏飞[1] 阮永丰[1] 贾敏[1] 李文润[1] 张宇晖[1] 张守超[1] 王丹丽[1] 

机构地区：[1]天津大学理学院,天津300072

出　　处：《硅酸盐通报》2009年第3期407-410,共4页Bulletin of the Chinese Ceramic Society

摘　　要：用剂量为5.74×1018cm-2的中子对Al2O3晶体进行了辐照,利用吸收光谱等手段观测了中子辐照引起的损伤及其恢复。中子辐照产生了大量的阴离子单空位(F和F+)、阴离子双空位(F2)及其它更高阶的缺陷。通过等时退火,发现低阶的阴离子单空位缺陷在较低温度下即可恢复,而高阶的缺陷则会在退火过程中得到加强,新的吸收峰(更高阶的缺陷)也会在退火过程中出现,在1000℃退火温度下,所有缺陷全部恢复。Al2O3single crystal was neutron-irradiated up to a dose of 5.74×1018cm-2. The radiation damage and recovery of neutron-irradiated was studied by means of spectrophotometer. The results indicated that the irradiation generated large amount of optically detectable defects such as anion vacancies （primarily F and F＋ center）, anion divacancies （F2 ） and some higher order defects. Through isochronal annealing, the low order defects such as anion vacancies may recover under the low temperature, the high order defects are strengthened and the new absorb peaks which meant the higher order defects appeare with annealing. However, when the annealing temperature is up to 1000℃, all the defects are recovered.

关 键 词：AL2O3 中子辐照 缺陷 吸收光谱 

分 类 号：O77[理学—晶体学]