Yuan Xu's research while affiliated with National Huaqiao University and other places

Ba(ZrxTi1−x)O3 ceramics (x = 0.15, 0.2, 0.25, 0.3) were prepared with solid-state reaction method. The ratio of Zr/Ti influences the crystal structure, micromorphology, ferroelectric and dielectric properties of BZT ceramics, which were characterized, respectively, by X-ray diffraction, scanning electron microscope, ferroelectric test system and dielectric test system. The X-ray diffraction patterns show that the zirconium titanate ceramic samples adopt cubic phase structure and no secondary phase. As the Zr4+ content increases, the lattice constant increases and the grain size decreases. BZT ceramic sample with 15% zirconium content has the highest dielectric constant. As the Zr4+ content increases, the dielectric constant is gradually decreased, and Curie temperature dropped from 334 to 226 K. The sample has the largest remanent polarization, when the zirconium ion content is 15%. Subsequently, the remanent polarization is reduced as the zirconium ion content increases.

MgO addition Ba(Zr0.15Ti0.85)O3 (BZT) ceramics was prepared using conventional solid state reaction method and effect the MgO content in BZT ceramics on their sintering temperature, microscopic appearance, dielectric properties and ferroelectric properties was investigated. The result is that the addition of MgO can greatly reduce the sintering temperature of BZT ceramics. The average grain size can be gradually reduced as the concentration of MgO increases. The lattice constant is reduced by Mg²⁺ entering the crystal structure instead of Ti⁴⁺ or Zr⁴⁺. BZT ceramics exhibit excellent dielectric properties when a small amount of MgO was added. The maximum dielectric constant moves to the low temperature region when MgO content was increases. The hysteresis loop becomes thinner and the coercive field was significantly reduced.