Influence of rare earth coordinated elements in titanium-based pyrochlores and their dielectric phenomena

Rare earth-coordinated titanium pyrochlores are one of the significant materials among inorganic ceramics for electronic applications. The titanate pyrochlores usually produce high ionic conductivity and low activation energy. It can also ascribe chemical stability, mechanical integrity, and good agreement with adjoining electrode materials. The rare-earth-based pyrochlores are acceptable for electrolyte applications as principal oxygen ion conductors. These materials are competitive for high-temperature solid oxide fuel cells. Only a few review reports are available on this unique structural compound. Fewer research data’s available about pyrochlore materials with significant electronic properties. Also, this article summarizes the crystal structure of pyrochlore materials with the coordination chemistry of rare earth elements on the various properties, including the dielectric response. This review mainly focuses on the compelling microcrystalline structures of pyrochlore materials and highlights its modernization progress. Specifically, the applications of rare earth pyrochlore titanates were also introduced and evaluated. The perspective and doping strategies are featured based on their future developments.