MgAl_2O_3透明陶瓷正电子湮没寿命谱的研究

The Research of MgAl_2O_3 Transparent Ceramics By Positron Lifetime Spectra Technique

作者采用正电子湮没寿命谱的方法 ,研究了Mg -Al尖晶石透明陶瓷经电子和质子辐照处理后的缺陷情况 ,以及在γ射线辐照下 ,其缺陷情况随γ射线剂量的变化规律 ;并研究了该样品的退火特性 .发现电子辐照样品时所产生的正离子空位 ,在注量大于 1× 1 0 1 6/cm2 时还可能存在F心 .质子辐照样品时 ,在较小注量下即能造成较多的损伤缺陷 .样品中的缺陷随着γ辐照剂量的增加出现三个阶段 .经质子和γ辐照后进行退火出现缺陷分解现象 .说明辐照后的样品中存在复杂的缺陷结构 .

Positron lifetime technique has been used to research the defects of MgAl 2O 3 Transparent ceramics irradiated by electrons and protons.Defect of MgAl 2O 3 transparent ceramics irradiated by γ-rays have been researched by positron lifetime technique too.The authors discover that positive ion vacancies appear by electron irradiation.If the dose more than 1×10 16 /cm 2 there will be some F centre in the material.Proton irradiation can make more defects than electron irradiation.The positron parameter...