Structure, Electrical Properties, and Thermal Stability of the Mn/Nb Co-Doped Aurivillius-Type Na0.5Bi4.5Ti4O15 High Temperature Piezoelectric Ceramics

In order to meet the urgent need for high temperature piezoelectric materials with a Curie over 400 °C, Mn/Nb co-doped strategy has been proposed improve weak performance of Aurivillius-type Na0.5Bi4.5Ti4O15 (NBT) ceramics. this paper, crystal structure, electrical properties, and thermal stability B-site Na0.5Bi4.5Ti4-x(Mn1/3Nb2/3)xO15 (NBT-100x) ceramics were systematically investigated by conventional solid-state reaction method. The structural analysis results indicate that NBT-100x have typical bismuth oxide layer type phase structure anisotropic plate-like morphology. lattice parameters grain sizes increase content. properties significantly improved modifications. maximum coefficient d33 was found be 29 pC/N NBT-2 ceramics, nearly twice unmodified NBT highest values planar electromechanical coupling factor kp thickness kt also obtained at 5.4% 31.2%, respectively. dielectric spectroscopy showed Tc is slightly higher than (646 °C). DC resistivity 106 Ω∙cm 500 °C. All together good demonstrated as an effective method based potential candidates applications.