钙钛矿结构Ba_(1-x)Sr_(x)ZrO_(3)对Sr的晶格固化  

Immobilization of Sr in perovskite-type Ba_(1-x)Sr_(x)ZrO_(3)

作　　者：刘海峰 赵键 王华 朱永昌 李婕 张行泉 郑奎 霍冀川 LIU Haifeng;ZHAO Jian;WANG Hua;ZHU Yongchang;LI Jie;ZHANG Xingquan;ZHENG Kui;HUO Jichuan(State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology;School of Materials Science and Engineering,Southwest University of Science and Technology;Ceramics Science Institute,China Building Materials Academy)

机构地区：[1]西南科技大学环境友好能源材料国家重点实验室 [2]西南科技大学材料科学与工程学院 [3]中国建筑材料科学研究总院有限公司陶瓷科学研究院

出　　处：《中国粉体技术》2022年第3期124-132,共9页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:51502249;四川省科技厅应用基础研究项目,编号:2020YJ0419;环境友好能源材料国家重点实验室开放基金,编号:18kfhg04。

摘　　要：为了寻求一种晶格更大、结构稳定的钙钛矿母相,实现对^(90)Sr的有效晶格固化,以^(88)Sr模拟^(90)Sr,以锆基钙钛矿型氧化物BaZrO_(3)为母相,采用溶胶-凝胶法制备Ba_(1-x)Sr_(x)ZrO_(3)(0≤x≤1)固化体;通过系列表征,分析烧结温度、Sr掺入量对固化体晶体结构、微观形貌及化学稳定性的影响。结果表明:采用溶胶-凝胶法成功制备了具有单一物相的钙钛矿型Ba_(1-x)Sr_(x)ZrO_(3),实现了对Sr的有效晶格固化;当x=1.0时,固化体对Sr的固溶量达到最大;半径较小的Sr^(2+)进入A位取代Ba^(2+),导致Ba_(1-x)Sr_(x)ZrO_(3)的晶胞体积和晶胞参数减小,但晶体结构稳定,并保持立方钙钛矿相;Ba_(1-x)Sr_(x)ZrO_(3)固化体中Sr的7 d浸出率在10^(-4) g·m^(-2)·d^(-1)级别,低于目前主要陶瓷固化体中Sr的浸出率。In order to develop a perovskite-type parent phase with larger lattice and stable structure to realize the lattice immobilization of ^(90)Sr effectively,Ba_(1-x)Sr_(x)ZrO_(3)(0≤x≤1)immobilization forms were synthesized by sol-gel method,with ^(88)Sr used as simulated element and zirconium-based perovskite-type BaZrO_(3) used as a parent phase.The results show that the perovskite-type Ba_(1-x)Sr_(x)ZrO_(3) with a single phase can be successfully synthesized by so-gel method.Sr is immobilized effectively in the lattice position of the perovskite-type oxide.The maximum solid soluble amount of Ba_(1-x)Sr_(x)ZrO_(3) for Sr has been obtained,i.e.,x=1.0.Sr^(2+)with smaller radius can enter the A position of perovskite-type Ba_(1-x)Sr_(x)ZrO_(3) to replace Ba^(2+),resulting in decrease of cell volume and lattice parameters,but the crystal structure is stable and maintain a cubic perovskite phase.The leaching rate(7 d)of Sr in Ba_(1-x)Sr_(x)ZrO_(3) is at the level of 10^(-4) g·m^(-2)·d^(-1),which is lower than that in the current main ceramic solidified bodies.

关 键 词：废物处理 锶 晶格固化 钙钛矿结构 

分 类 号：TL941[核科学技术—辐射防护及环境保护]