High‐temperature BiFeO <sub>3</sub> –PbTiO <sub>3</sub> ‐Ba(Zr,Ti)O <sub>3</sub> ternary ceramics with excellent piezoelectricity
Yixuan Chen, Jie Jian, Jianguo Chen, Jinrong Cheng
Abstract
Abstract Ternary ceramics of (0.87− x )BiFeO 3 – x PbTiO 3 –0.13Ba(Zr 0.5 Ti 0.5 )O 3 (BF– x PT–0.13BZT, 0.27 ≤ x ≤ 0.37) were prepared by the traditional solid state reaction methods. X‐ray diffraction results display that BF‐ x PT‐0.13BZT ternary ceramics of x ≥ 0.29 exhibit the perovskite structure with dominant tetragonal (T) phases mixed with a small amount of rhombohedral (R) phases. Scanning electron microscopy (SEM) images reveal that the average grain size of BF‐ x PT‐0.13BZT ternary ceramics is in a range of 10–11 μm, increasing first and then decreasing with the increase of PbTiO 3 (PT) content. The low tanδ of about 0.015 and high Curie temperature T c of above 450°C were obtained for BF‐ x PT‐0.13BZT ternary ceramics. Moreover, the fluctuation of piezoelectric coefficient d 33 is less than ±10% over a broad temperature range of 30°C–400°C. BF‐ x PT‐0.13BZT ternary ceramics for x = 0.33 possess the maximum T c and d 33 of 470°C and 320 pC/N respectively, with the room temperature resistivity of about 10 11 Ω·cm. These results indicate that BF‐ x PT‐0.13BZT ternary ceramics for x = 0.33 with both excellent piezoelectric properties and high Curie temperature have promising applications in high‐temperature piezoelectric devices.