High Electric-Induced Strain and Temperature-Dependent Piezoelectric Properties of 0.75BF-0.25BZT Lead-Free Ceramics

作者：Chen, Jianguo^*; Cheng, Jinrong

来源：Journal of the American Ceramic Society, 2016, 99(2): 536-542.

DOI：10.1111/jace.14003

• MICROSTRUCTURE
• TITANATE
• PZT

0.75BiFeO(3)-0.25Ba(ZrxTi1-x) + 0.6 wt% MnO2 (0.75BF-0.25BZT) ceramics with Mn addition were prepared by the solid-state reaction method. The high-field strain and high-temperature piezoelectric properties of 0.75BF-0.25BZT 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 0.75BZT-0.25BT ceramics reached the maximum at Zr content of 10 mol%. The Curie temperature T-c, dielectric constant epsilon and loss tan (1 kHz), piezoelectric constant d(33), and planner electromechanical coupling factor k(p) of 0.75BF-0.25BZT ceramics with 10 mol% Zr were 456 degrees 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 BiScO3-PbTiO3 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 degrees domain switching. Rayleigh analysis reflected that the improved piezoelectric properties resulted from the enhanced extrinsic contribution by Zr doping. The unipolar strain of 0.75BF-0.25BZT ceramics with 10 mol% Zr was almost linear from RT to 200 degrees C. These results indicated that 0.75BF-0.25BZT ceramics were promising candidates for high-temperature and lead-free piezoelectric actuators.

• 出版日期2016-2
• 单位上海大学