Effect of Co Doping on the Structural and Electrical Properties of CaBi₂Nb₂O₉ Ceramics

Abstract

CaBi2Nb2-xCoxO9 ceramics were prepared by a solid-state reaction method. The effect of Co doping on their piezoelectric, dielectric and conductive properties was studied. The results show that the structure of Co doped CBN ceramics is the orthorhombic symmetry and CaBi2Nb1.95Co0.05O9 ceramics are found with impurity phase. All of the CBNCo ceramics have compact structures and are in good sinter condition. The density and the piezoelectric activity of CBN ceramics are obviously improved with Co doping contents. Co dopant greatly decreases the dielectric loss values and slightly increases the Curie-temperature of CBN ceramics. Meanwhile, the introduction of Co dopant increases the number of defects and thus changes the conductive mechanism.

Keywords

• doping
• piezoelectric property
• dielectric property
• DC resistivity
• defect