Influence of CuO Additive on Physical Properties of BaTiO3 Ceramics
Various ceramics were prepared by the conventional solid-state reaction technique according to the compositional formula of (1-x) BaTiO3+xCuO withx= 0.00 ~ 0.05. The influence of CuO additive on microstructure, crystalline structure and dielectric and piezoelectric properties were investigated. It has been found that CuO acts like a sintering aid in the CuO-modified BaTiO3ceramics to promote the ceramic densification and suppress the abnormal grain growth during sintering process, and decreases the orthorhombic-tetragonal phase transition temperature. The CuO-modified BaTiO3ceramics show desirable microstructures with high density, small average grain size and uniform grain size distribution. For the one withx= 0.01, it has the good piezoelectric properties ofd33= 300 pC/N,kp= 0.49,k33= 0.62 andQm= 425 at room temperature, and exhibits aε'peak at -5°C and ad33maximum of 353 pC/N at 0°C, respectively.