2015/10/27 by Jianguo Chen, Jinrong Cheng · 2 citations
Materials Science · Engineering · #Ferroelectric and Piezoelectric Materials #Acoustic Wave Resonator Technologies #Multiferroics and related materials
paper · doi:10.1111/jace.14003
0.75BiFeO 3 –0.25Ba(Zr x Ti 1− x ) + 0.6 wt% MnO 2 (0.75 BF –0.25 BZT ) ceramics with Mn addition were prepared by the solid‐state reaction method. The high‐field strain and high‐temperature piezoelectric properties of 0.75 BF –0.25 BZT ceramics were studied. Introduction of Zr in the solid solutions decreased the Curie temperature slightly, and improved the dielectric and piezoelectric properties obviously. The piezoelectric properties of 0.75 BZT –0.25 BT ceramics reached the maximum at Zr content of 10 mol%. The Curie temperature T c , dielectric constant ε and loss tanδ (1 kHz), piezoelectric constant d 33 , and planner electromechanical coupling factor k p of 0.75 BF –0.25 BZT ceramics with 10 mol% Zr were 456°C, 650, 5%, 138 pC/N, and 0.30, respectively. The high‐field bipolar and unipolar strain under an electric field of 100 kV/cm reached up to 0.55% and 0.265%, respectively, which were comparable to those of BiScO 3 –PbTiO 3 and “soft” PZT ‐based ceramics. The typical “butterfly”‐shaped bipolar strain and frequency‐dependent peak‐to‐peak strain indicated that the large high‐field‐induced strain may be due to non‐180° domain switching. Rayleigh analysis reflected that the improved piezoelectric properties resulted from the enhanced extrinsic contribution by Zr doping. The unipolar strain of 0.75 BF ‐0.25 BZT ceramics with 10 mol% Zr was almost linear from RT to 200°C. These results indicated that 0.75 BF –0.25 BZT ceramics were promising candidates for high‐temperature and lead‐free piezoelectric actuators.