Characterizations of the core-shell structured BST composites nanopowders and ceramics

Abstract

BST nanoparticles were directly synthesized from solution at 80℃ and then wrapped with zinc doped MgO in solution under ultrasonic dispersion at room temperature.This core-shell structure was analyzed by a conjunction of XRD, HRTEM and FE-SEM. The lattice cell parameter of BST core was found to have shrinkage. The lattice cell mismatch between core and shell make a fluctuation of lattice cell parameter of BST core. The nanoparticles can also be observed by FESEM in fractured grains of the ceramics. The dielectric properties were evaluated at different temperatures and frequencies. It is obvious that the core-shell structured BST composites are promising candidates to be used in high frequency devices.