γ射线辐照及其后退火MgAl_2O_4透明陶瓷中缺陷运动行为的研究  

EFFECT OF γ-IRRADIATION AND ANNEALING ON DEFECTS BEHAVIORS IN TRANSPARENT MgAl_2O_4 CERAMICS

作　　者：何捷[1] 林理彬[1] 王鹏[1] 卢勇[1] 邹萍[2] 

机构地区：[1]四川大学物理系,成都610064 [2]四川大学分析测试中心,成都610064

出　　处：《硅酸盐学报》2002年第5期574-578,共5页Journal of The Chinese Ceramic Society

摘　　要：用不同剂量的γ射线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 ,UV -VIS和FT -IR ,PAT测试表明 ,辐照前 3 3 60cm- 1 处有吸收峰 ,它是由VOH- 心吸收引起的 ,通过γ射线辐照 ,样品在 3 70nm处产生吸收带 ,它是由辐照产生的V型色心吸收引起的 ,通过退火可以使V型色心吸收带消除。结果表明 :对陶瓷γ射线辐照及退火 ,将使样品中的空位团发生分裂和空位聚集。较低剂量的γ射线辐照能降低陶瓷紫外到红外透过率 ,大剂量的γ射线辐照能在陶瓷中产生局域退火效应 。Transparent MgAl 2O 4 ceramics was exposed to 60 Co γ_ray with doses from 0.1 kGy to 3 500 kGy and isochronally annealed. The samples were studied by PAT, UV-VIS and FT-IR. Before irradiation there is an absorption peak at 3 360 cm -1 , which is induced by the V OH - center. There is a broad optical_absorption band at 370 nm, which is due to V_type color centers absorption in MgAl 2O 4 ceramics after irradiation. The V_type color centers can be destroyed by heat treatment. The results show that vacancy clusters in the samples can be split into single_vacancies in the process of γ_irradiation and the single_vacancies can be aggregated again in the process of annealing. The γ_ray with low doses decrease transmittance of the samples from ultra violet to infrared region. With the increasing of the dose, however, it induces a thermal effect to increase the infrared transmittance of the samples.

关 键 词：Γ射线辐照 后退火 MgAl2O4透明陶瓷 缺陷 运动行为 研究 尖晶石透明陶瓷 V型色心 

分 类 号：TQ174.75[化学工程—陶瓷工业]