四水硝酸钙熔盐的结构研究  

A Study on the Structure of Calcium Nitrate Tetrahydrate Molten Salt

作　　者：房艳[1] 房春晖[1] 林联君[1] 秦绪峰[1] 

机构地区：[1]中国科学院青海盐湖研究所,青海西宁810008

出　　处：《盐湖研究》2007年第1期39-43,共5页Journal of Salt Lake Research

基　　金：国家基金资助项目(20373083)

摘　　要：用θ～θ液体衍射仪精确测量了Ca（NO3）2·4H2O熔体的X射线衍射数据，通过数据处理给出了熔盐的结构函数和实验径向分布函数曲线，并由r=0．618λ／sinθ对结构函数曲线进行了定性描述；通过理论模型计算获得了熔体配住结构参数。研究结果表明，熔体中至少存在一种带单氧桥键或双氧桥键的双核配合物；并用计算给出的局域结构模型，讨论了熔体结构对晶体生长过程的影响。X-ray diffraction of molten salt Ca（NO3）2·4H2O at 20℃ has been measured with a θ-θ type X-ray diffractometer. Liquid structural function and radial distribution function of the supercooled liquid have been calculated from the diffraction intensity. Diffraction intensity curve was described by an empirical equation r = 0.618）λ/sinθ. The structural parameters of complexes in the molten salt have been obtained from calculation of a theoretical model. The result shows that at least a binuctear complex with a single-oxygen-bridge or a doubleoxygen-bridge bond exists in the molten salt. The influence of the structure of the supercooled hydrate on crystallization has been discussed by local structure information.

关 键 词：水溶液结构 Ca(NO3)2·4H2O 离子簇 双核配合物 熔盐 X-射线衍射 

分 类 号：O645.4[理学—物理化学]