Gd_2Zr_(2-x)Ce_xO_7(0.0≤x≤2.0)的制备与表征  

Syntheses and Charaterization of Gd_2Zr_(2-x)Ce_xO_7(0.0≤x≤2.0)

作　　者：宁明杰[1] 董发勤[2] 张宝述[1] 卢喜瑞[2] 唐敬友[2] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]西南科技大学核废物与环境安全国防重点学科实验室,四川绵阳621010

出　　处：《原子能科学技术》2013年第2期202-206,共5页Atomic Energy Science and Technology

基　　金：863计划重点课题资助项目(2009AA050703);国家自然科学基金资助项目(51074131);西南科技大学核废物与环境安全国防重点学科实验室基金资助项目(11zxnk09)

摘　　要：为获得钆锆烧绿石基固化体固化Pu后的物理性能、物相变化及微观形貌,本研究用Ce4+模拟Pu4+,以Gd2O3、ZrO2和CeO2粉体为原料,采用高温固相法,制备不同固溶度(0～100%,按摩尔计)的系列钆锆烧绿石固化体,并对密度、硬度、物相和微观形貌等进行表征。结果表明:实验所得系列固化体的密度和硬度均随着x的增大而增大,硬度HV与x满足关系式HV=661.272 73+223.936 36x(R2=0.946 38)。在x=0.0时,所得固化体为单一的烧绿石结构;在x=0.2时,固化体从烧绿石结构转变为萤石型结构;在0.2≤x≤2.0范围内,固化体均为单一萤石型结构。固化体微观形貌不规则,呈板块状。In order to get the physical properties, phase change and microstructure of waste forms containing plutonium, cerium with four valences was used as the simulacrum for plutonium with tetravalence. Pyrochlore Gd2 Zr2 07 as waste forms was prepared by Gd20a, ZrO2 and CeO2 powders with high temperature solid-state method. The solid solubility of pyrochlore Gd2Zr207 is ranged from 0 to 100% （in mole） dosage. Waste forms were characterized with density, rigidity, phase composition and micromorphology. The results show that density and rigidity Hv increase with x, rigidity and the addition of Ce satisfy the relation： Hv=661. 272 73＋223. 936 36x （R2 =0. 946 38）. When x=0.0, the waste forms are single pyrochlore structure; when x=0.2, the waste forms transform from pyrochlore into fluorite structure. In the interval 0.2≤x≤2.0, the waste forms are single fluorite structure. Microstructure of waste forms is not

关 键 词：钆锆烧绿石 高温固相法 模拟 

分 类 号：TL941.33[核科学技术—辐射防护及环境保护]