High capacity crystal immobilization of U5+ and U6+ by ZrSiO4 ceramics

被引：5

作者：

Xiong, Yingwei ^{[1
]}

Zhang, Yanming ^{[1
]}

Li, Jiajing ^{[2
]}

Dan, Hui ^{[2
]}

Ding, Yi ^{[2
]}

机构：

[1] Mianyang Teachers Coll, Mianyang Teachers Coll Sichuan Prov, Engn Res Ctr Chuanxibei RHS Construct, Mianyang 621000, Peoples R China

[2] Southwest Univ Sci & Technol, Sch Natl Def Sci & Technol, Mianyang 621010, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2023年 / 49卷 / 08期

基金：

中国国家自然科学基金;

关键词：

ZrSiO4; Ceramic; Uranium; Nuclear waste; Crystal immobilization; PHASE EVOLUTION; GLASS-CERAMICS; ZIRCON; URANIUM; ND; DURABILITY; ADSORPTION; STABILITY; PLUTONIUM; DISPOSAL;

D O I：

10.1016/j.ceramint.2022.12.134

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

ZrSiO4-based ceramics have been considered as one of the candidate nuclear waste forms, while the immobili-zation behavior of mixed-valent uranium in the structure of the ceramics was unclear. Herein, ZrSiO4-U ceramics with a general formula of Zr1-4x(U-x(6+) U-2x(5+))SiO4 were designed and synthesized. The evolutions of phase and microstructure depending on the content of U were investigated. The ceramics with 0 <= x < 0.04 showed a single ZrSiO4 phase, while U3O8 phase was detected when x >= 0.04. The results demonstrated that the solubility limit of U in ZrSiO4 ceramic was up to 1.51 at.% or 11.06 wt%. The calculated lattice parameters increased with the increase of U content. The increased parameters provided the evidence of the immobilization of both U5+ and U6+ into ZrSiO4 crystal lattice by replacing Zr4+. Furthermore, the obtained ZrSiO4-U ceramics exhibited good aqueous durability (similar to 10(-5) g m(-2) d(-1)). The results indicated that ZrSiO4-based ceramics can be employed to effectively immobilize mixed-valent U.

引用

页码：12696 / 12701

页数：6

共 39 条

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