Vanadium doping effects on microstructure and dielectric properties of barium titanate ceramics

Abstract

V-doped barium titante ceramics were prepared by conventional solid state reaction method. XRD patterns show that V 5+ ions have entered into the tetragonal perovskite structure of solid solution to substitute for Ti 4+ ions on the B sites. Addition of vanadium accelerates grain growth of BTO ceramics and there is abnormal grain growth of barium titanate ceramics with higher vanadium concentration. Vanadium doping can increase the Curie temperature and decrease the dielectric loss of barium titanate ceramics. As vanadium concentration increases, the remnant polarization of V-doped BTO ceramics begins to increase and reaches the maximum and then decreases. The coercive electric field for V-doped barium titanate ceramics decreases with the increasing of vanadium concentration. As temperature rises, the remnant polarization and the coercive electric field of V-doped barium titanate ceramics decrease simultaneously.