刘海峰^{1a, 1b}，赵 键^1b，王 华²，朱永昌2，李 婕^1b，张行泉^{1a, 1b}，郑 奎^1a，霍冀川^{1a, 1b}

(1.西南科技大学 a.环境友好能源材料国家重点实验室; b.材料科学与工程学院，四川 绵阳 621010；2.中国建筑材料科学研究总院有限公司 陶瓷科学研究院, 北京 100024)

DOI:10.13732/j.issn.1008-5548.2022.03.015

收稿日期： 2021-12-16， 修回日期：2022-03-31，在线出版时间：2022-04-25。

基金项目：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。

第一作者简介：刘海峰(1983—)，男，副教授，博士，研究方向为钙钛矿结构氧化物功能材料、核素晶格固化。E-mail：liuhaifeng@swust.edu.cn。

通信作者简介： 霍冀川(1962—)，男，教授，硕士，博士生导师，研究方向为核素晶格固化。E-mail：huojichuan@swust.edu.cn。

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⁹⁰Sr的有效晶格固化，以⁸⁸Sr模拟⁹⁰Sr,以锆基钙钛矿型氧化物BaZrO₃为母相，采用溶胶-凝胶法制备Ba_1-xSr_xZrO₃(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-xSr_xZrO₃,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Sr²⁺进入A位取代Ba²⁺,导致Ba_1-xSr_xZrO₃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-xSr_xZrO₃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。

关键词：废物处理；锶；晶格固化；钙钛矿结构

Abstract：In order to develop a perovskite-type parent phase with larger lattice and stable structure to realize the lattice immobilization of ⁹⁰Sr effectively, Ba_1-xSr_xZrO₃(0≤x≤1) immobilization forms were synthesized by sol-gel method, with ⁸⁸Sr used as simulated element and zirconium-based perovskite-type BaZrO₃ used as a parent phase. The results show that the perovskite-type Ba_1-xSr_xZrO₃ 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-xSr_xZrO₃ for Sr has been obtained, i.e., x=1.0. Sr²⁺ with smaller radius can enter the A position of perovskite-type Ba_1-xSr_xZrO₃ to replace Ba²⁺, 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-xSr_xZrO₃ is at the level of 10^-4 g·m^-2·d^-1, which is lower than that in the current main ceramic solidified bodies.

Keywords：waste treatment; Sr; lattice immobilization; perovskite-type

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