Ferroelectric Behavior of CuO Doped Ba (Ti_0.91Zr_0.09) O₃ Ceramics

Abstract

Ba (Ti_0.91Zr_0.09) O₃ ceramics doped with CuO were prepared by a solid phase reaction. The ferroelectric properties of Ba (Ti_0.91Zr_0.09) O₃ ceramics were investigated. The results revealed that the materials are of relaxor type at Orthorhombic-Tetragonal phase transition point and undergoes a diffuse phase transition at Tetragonal-Cubic phase transition point. A non-linear P-E loop and narrow loop are observed, which exhibit a typical ferroelectric relaxor characteristic at the room temperature. Remanent polarization P_r and coercive electric field E_C decrease with increasing dopant concentration, A remanent polarization of 0.20 μC/cm² and a coercive filed of 0.81 KV/cm for BTZC38 at the room temperature were obtained.

Keywords:

• Ba(Ti_0.91Zr_0.09)O₃ ceramics
• dielectric properties
• diffuse phase transitions
• remanent polarization
• coercive electric field

Acknowledgments

The work was supported by Key Disciplinary of Materials Science under Grant No XZD0814-09-1, and the talents foundation of Xihua University under Grant No R0620109.