Microstructure and Electrical Properties of Nonstoichiometric 0.94(Na0.5Bi0.5+x)TiO3–0.06BaTiO3Lead‐Free Ceramics

• DOI: 10.1111/jace.13941
• Publication Date: 2015-09-24T13:12:05Z
• Authors: Xiao‐Shuang Qiao; Xiao‐Ming Chen; Han‐Li Lian; Wei‐Ting Chen; Jian‐Ping Zhou; Peng Liu
• Keywords: Dielectric loss; Lattice constant

0.94(Na 0.5 Bi 0.5+ x )TiO 3 –0.06BaTiO ( = −0.04, 0, 0.02; named NB 0.46 T‐6 BT , 0.50 0.52 respectively) lead‐free piezoelectric ceramics were prepared via the solid‐state reaction method. Effects of 3+ nonstoichiometry on microstructure, dielectric, ferroelectric, and properties studied. All show typical X‐ray diffraction peaks ABO perovskite structure. The lattice parameters increase with in content. electron probe microanalysis demonstrates that excess 2 O starting composition can compensate loss induced during sample processing. size shape grains are closely related to For unpoled there two dielectric anomalies constant–temperature curves. shows one anomaly accompanied by high constant at low frequencies. After poling, a new appears around depolarization temperature T d ) for all values amount decreasing from deficiency. diffuse phase transition character was studied Curie–Weiss law modified law. activation energy obtained impedance analysis 0.69, 1.05, 1.16 eV respectively, implying change oxygen vacancy concentration ceramics. constant, polarization, coercive field variation Rayleigh suggests electrical is effect vacancies.