Abstract
Pure and Mn/Y codoped Ba0.67Sr0.33TiO3 (BST) ceramics were fabricated via the citrate–nitrate combustion technique, and the microstructure and electrical properties of BST ceramics were mainly investigated. The Mn/Y codoping concentration has a strong influence on the microstructure and electrical properties of BST ceramics. All BST ceramics possess a pure polycrystalline structure. The density, dielectric loss, leakage current, and ferroelectric properties are improved by codoping 0.5mol% Mn and 1.0mol% Y to BST. The relative density of 0.5mol% Mn/1.0mol% Y-codoped BST (BST0510) ceramics reaches 97.5% of the theoretical value. BST0510 ceramics have the lowest dielectric loss (tanδ<0.0073 at 1kHz) among all BST ceramics. BST0510 ceramics also demonstrate a low leakage current density (1.23×10−7A/cm2) at an applied field of 10kV/cm, and excellent ferroelectric properties with a remanent polarization of 2Pr=15.327μC/cm2 and a coercive field of 2Ec=3.456kV/cm. Therefore, the Mn and Y with optimum content help improve the electrical properties of BST materials.
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