Influence of CuO Additive on Physical Properties of BaTiO₃ Ceramics

Abstract

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.

Dielectric Properties of Barium Titanate Ceramics Modified by CuO in Different Methods

“…And researches showed that CuO has a strong effect on the dielectric properties of BaTiO 3 when it was doped together with BaO. On the other hand, pure CuO also showed possibility to modify the dielectric propertied of BaTiO 3 in recent research [15] . Besides, so many previous studies showed that one oxide may show novel activity in different doping methods [16][17][18] .…”

“…On the other hand, when CuO was doped solely into BaTiO 3 , Cu 2+ ions have two states: incorporating into the lattice and presenting in boundary phase. Researches on the accepter doped BaTiO 3 have shown that the dopant element can penetrate into the grain boundaries [15,17,20] . Similarly, we consider that CuO doped BaTiO 3 exhibit this mechanism.…”