Thermal processing-induced domain reconfiguration and property enhancement in BiFeO3–BaTiO3 ceramics for high temperature applications

作者：Bing Wang, Ziqi Yang, Xiaodong Liu, Yizhe Li, Andreas Wohninsland, Lalitha Kodumudi Venkataraman, Bingying Xie, Annette Kleppe, David A. Hall · 发表于：Materials Today Physics · 年份：2025 · DOI：10.1016/j.mtphys.2025.101836 · 被引用次数：1 · 研究领域：Ferroelectric and Piezoelectric Materials、Multiferroics and related materials、Dielectric materials and actuators

High temperature ferroelectric ceramics have generated significant interest in recent years, from both a fundamental perspective and for practical applications as temperature-stable dielectrics or piezoelectric transducers. Particularly, BiFeO 3 -BaTiO 3 ceramics show great promise as a replacement for lead-based materials in demanding environments. In the present study, as-sintered BiFeO 3 -BaTiO 3 ceramics are subjected to different heat treatment conditions (annealing and quenching processes) and poling procedures to evaluate their influence on the domain configuration and functional properties. As a result, the modified 0.7BiFeO 3 -0.3BaTiO 3 ceramics were found to exhibit a remanent polarization of 0.44 C m −2 at 100 °C, a Curie temperature of 500 °C and planar electromechanical coupling factor of 0.6 near the depolarization temperature of 480 °C after quenching at 800 °C in air; these materials show excellent potential for applications in high temperature piezoelectric transducers. In-situ temperature-dependent X-ray diffraction studies revealed unusual enhancement of the rhombohedral distortion on heating to temperatures ∼200 °C, associated with re-entrant relaxor ferroelectric behaviour. The ferroelectric domain configuration evolved from a disordered nanodomain structure in the as-sintered ceramic to a more structured herringbone-type nano-domain structure for the quenched sample, comprising a mixture of 180° and non-180° domain walls. Subsequent direct current polin...