哈尔滨工程大学学报2025，Vol.46Issue(11)：2190-2198,9.DOI:10.11990/jheu.202507011
高温熔盐法合成铀酰硅酸盐晶体[K4Cs2][(UO2)3(Si8O22)]
Synthesis of a uranyl silicate crystal[K4Cs2][(UO2)3(Si8O22)]via a high-temperature molten salt method
摘要
Abstract
To comprehensively investigate the potential effects of uranyl silicates on uranium and radionuclide mi-gration during the geological disposal of spent nuclear fuel,this work aims to synthesize a novel uranyl silicate crys-tal[K4Cs2][(UO2)3(Si8O22)]via a high-temperature molten salt method.The crystal structure was characterized through single-crystal X-ray diffraction(XRD),powder XRD,scanning electron microscopy,energy-dispersive X-ray spectroscopy,and Raman spectroscopy.The crystal adopts a monoclinic framework in the C2/m space group,featuring a three-dimensional architecture composed of uranyl-centered hexagonal bipyramids and corner-sharing SiO4 tetrahedra.These tetrahedra assemble into octameric[Si8O22]12-units,with potassium and cesium ions resi-ding in structural channels to maintain charge balance.Variable-temperature XRD analyses further confirmed its excellent thermal stability within the range of 50～900℃.关键词
核废物处理处置/铀酰硅酸盐/高温熔盐法/晶体合成/框架结构/硅酸八聚体/钾铯离子共掺/热稳定性Key words
nuclear waste treatment and disposal/uranophane silicates/high-temperature molten salt method/crys-tal synthesis/framework structure/silicate octamer/potassium-cesium ion co-doping/thermal stability分类
化学化工引用本文复制引用
韩振宇,张笑晨,杨庆明,战春源,王靖阳,刘德邦,张萌,张蕾..高温熔盐法合成铀酰硅酸盐晶体[K4Cs2][(UO2)3(Si8O22)][J].哈尔滨工程大学学报,2025,46(11):2190-2198,9.基金项目
国家自然科学基金项目(U2267223) （U2267223）
中核集团领创科研项目(CNNC-LCKY-202250) （CNNC-LCKY-202250）
中核青年英才项目启明星项目(KY90200230015). （KY90200230015）
