Role of mechanical milling on the synthesis and ionic transport properties of fast fluoride ion conducting materials

This review article presents the use of mechanical milling technique for the synthesis of a variety of fast fluoride ion conducting materials for different electrochemical device applications. The influence of various milling parameters such as milling time, type of the milling pot, and rotation speed on the structural and transport parameters of different fluoride-based materials is reviewed. The advantages and disadvantages of the milling technique in comparison to the other methods are outlined. The ionic conductivity values of different fast fluoride ion conducting materials prepared by various synthesis routes are compared. At the end, it is observed that mechanical milling is an easy and promising method for the synthesis of different fast fluoride ion conducting materials in comparison to the same by other methods and furthermore, their ionic transport results indicate an enhancement in conductivity values by two to four orders in the mechanochemically synthesized materials.