摘要
碱金属氟化物-氟化锆体系是核反应熔盐堆冷却剂和燃料盐载体最具潜力的应用对象.采用Raman光谱法研究了MF-ZrF_(4)(M=Li,Na,K)体系的离子结构,探讨了温度和ZrF_(4)摩尔分数对体系中离子团的形式和相互转化规律的影响.研究表明,MF-ZrF_(4)体系中主要存在ZrF^(4-)_(8),ZrF^(3-)_(7),ZrF^(2-)_(6),ZrF-5四种Zr-F结构,在较高温度时还存在Zr_(3)F^(8-)_(20),Zr_(2)F^(5-)_(13)和Zr_(2)F^(3-)_(11)络合离子团;随着温度的升高,体系中ZrF^(3-)_(7)离子团的相对含量减少,ZrF^(4-)_(8),ZrF^(2-)_(6)和ZrF-5离子团的相对含量增加;随着温度的升高或体系中ZrF_(4)摩尔分数的增大,ZrF^(4-)_(8),ZrF^(3-)_(7),ZrF^(2-)_(6),ZrF-5四种络合离子团的结构变得不稳定.
Alkali metal fluoride-zirconium fluoride system was considered as one of the most promising candidates for nuclear fuel carriers and coolants in nuclear reactors.To identify the form and mutual transformation of the complexes,the ionic structure of MF-ZrF_(4)(M=Li,Na,K)systems were measured using Raman spectra technique in this paper,and the effect of temperature and content of ZrF_(4) on the ionic structure was discussed.The results show that LiF-ZrF_(4),NaF-ZrF_(4),and KF-ZrF_(4) systems mainly contain four kinds of Zr-F complexes:ZrF^(4-)_(8),ZrF^(3-)_(7),ZrF^(2-)_(6),and ZrF-5.At high temperatures,Zr_(3)F^(8-)_(20),Zr_(2)F^(5-)_(13) and Zr_(2)F^(3-)_(11) complexes exist in the systems.As the temperature increases,the relative content of ZrF^(3-)_(7) decreases,while the relative contents of ZrF^(4-)_(8),ZrF^(2-)_(6),and ZrF-5 increase.Besides,the structures of the four complex ions(ZrF^(4-)_(8),ZrF^(3-)_(7),ZrF^(2-)_(6),and ZrF-5)become unstable as the temperature or the mole fraction of ZrF4 in the molten salt increases.
作者
于江玉
胡宪伟
刘成员
康铱潇
张一帆
石忠宁
王兆文
Yu Jiangyu;Hu Xianwei;Liu Chengyuan;Kang Yixiao;Zhang Yifan;Shi Zhongning;Wang Zhaowen(Northeastern University Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),Shenyang 110819,China;Northeastern University School of Metallurgy,Shenyang 110819,China)
出处
《材料与冶金学报》
CAS
北大核心
2021年第4期310-314,共5页
Journal of Materials and Metallurgy
基金
国家自然科学基金面上项目(51974081)
辽宁省自然科学基金面上项目(2019-MS-129).
