High entropy rare-earth ortho-niobates

High entropy oxides are one the most interesting new groups of ceramics. Their complex properties are interesting both from basic research and application point of view. Our previous work focused on the properties of proton conductors with low entropy. The current project aims on understanding of the relation of high configurational entropy of rare-earth ortho-niobates and their crystalline and electronic structure. The measurement of x-ray absorption will possibly reveal the relation between the cation composition and unoccupied electron densities for studied materials, this can be then linked to the materials electrochemical performance, ionic conductivity, and proton uptake. This will lead both to a better understanding of phenomena occurring in these materials but also will allow tailoring materials with desired properties for applications in proton-conducting cells.