Fabrication of BaTiO3@FeO core-shell nanoceramics for dielectric capacitor applications

Nanoceramics have a wide application in dielectric field due to their excellent dielectric properties .However, it is extremely difficult to fabricate densified BaTiO 3 with nanometer scale crystalline. In this study, nanoscaleBaTiO 3 ceramics are successfully fabricated by deposition of a FeO layer onto BaTiO 3 nanoparticle , and the structure and dielectric behavior of the BaTiO 3 @FeO nanoceramics are systematically investigated. The multilayer structure including 1) an inner tetragonal core, 2) a gradient lattice strain layer and 3) a surface insulating layer makes the dielectric constant peak tend to be rounded and broadened. Consequently, an excellent temperature/frequency stability met the X7R requirements and accompanied by the low dielectric loss are achieved in the BaTiO 3 @FeO nanoceramics.