Coordination states of metal ions in molten salts and their characterization methods

The macroscopic characteristics of the molten salt are governed by its microstructure. Research on the structure of molten salt provides the foundation for a full understanding of the physicochemical properties of molten salt as well as a deeper analysis of the microscopic electrolysis process in molten salt. Individuals can obtain information about the microstructure of matter with the help of several speculative and experimental procedures. The advantages and disadvantages of the various test procedures used to determine the microstructure of molten salt are compared in this paper. In the molten salt system, the typical coordination configurations of metal ions are also summarized. Furthermore, the impact of temperature, anion, cation, and metal oxide (O^2-) on the structure of molten salt is discussed in detail. It was suggested that the accuracy and completeness of molten salts' structure information need to be investigated by the integration of multiple methods and interdisciplinary. The microstructure and coordination of molten salt deepens the understanding of the elementary elements of the microstructure of matter. This paper, based on the review of coordination states of metal ions in molten salts, is hoped that it can inspire researchers to explore the interrelationship between microstructure and macroscopic properties of materials.