BaTiO3 ceramics are common components of capacitors, sensors, and actuators. Recent research has focused on improving the dielectric properties of BaTiO3 by using Zr ions for B-site substitution. Additional additives can further enhance ceramic performance. In this work, BaZr0.15Ti0.85O3 (BZT) ceramics were prepared by a solid-phase reaction at various contents of added Al ions. All of the ceramic samples had a perovskite cubic phase structure. Compared with BZT ceramics without added Al2O3, the size of the grains increased considerably, and the grain size decreased slightly in accordance with increasing concentration of Al ions. Addition of Al ions considerably increased the density of the ceramics, yet excessive addition of Al ions decreased the density. The dielectric constants were relatively large when the Al ion content was 0.25 and 1.0 mol.%: 9117 and 8725 C2/(Nm2), respectively, at the Curie temperature. Compared with BZT ceramics without Al ions, the dielectric properties were greatly improved, by two different mechanisms (depending on the Al content). In accordance with increasing Al content, the hysteresis loop was narrower, the remanent polarization decreased, and the coercive electric field increased
Zhang Kai-Tuo1, Xu Yuan1, 2, 3, Chen Li-Gui3, Fu Lei3, Jia Shi-Kui3, Zhao Zhong-Guo3 1College of Cable Engineering, Henan Institute of Technology, Xinxiang, 453003, China 2College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, China 3School of Material Science and Engineering, Shaanxi University of Technology, Hanzhong, 723003, China
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