Effects of Rare-Earth Doping on Dielectric Properties of CaCu₃Ti₄O₁₂Ceramics

Abstract

The Ca_1−xNd_xCu₃Ti₄O₁₂(x = 0.0%, 0.1%, 0.5% and 1.0%, respectively) ceramics were synthesized by the solid-state reaction method in the temperature range of 1000°C to 1100°C, and single-phase structures with space group Im3 were obtained up to x = 1.0%. The effects of Nd-substitution on the dielectric properties and conductivity of Ca_1−xNd_xCu₃Ti₄O₁₂ceramics were investigated and discussed. The room temperature dielectric constant and dielectric loss of Ca_1−xNd_xCu₃Ti₄O₁₂ceramics slightly decreased with x = 0.1% and 0.5%, but increased with x = 1.0%. The Nd-substitution has little effect on the giant dielectric constant step but a strong effect on the high-temperature dielectric relaxations.

Keywords:

• CaCu₃Ti₄O₁₂ceramics
• dielectric properties
• defects

Acknowledgments

The present work was supported by Qianjiang Project of Zhejiang Province under Grant No. 2009R10038 and the Opening Foundation of Zhejiang Provincial Top Key Discipline.