Phase transition and large strain response with ultra-low hysteresis of BaTiO3 doped with a high-entropy perovskite oxide

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2024-05, Vol.488, p.150823, Article 150823
• Main Authors: Liu, Jia, Ma, Cuiying, Liang, Ruinan, Zhao, Xing, Bai, Yuhang, Liu, Xiao, Ren, Ke, Du, Huiling, Wang, Yiguang
• Format: Article
• Language: English
• Subjects: BaTiO3 ceramics; High-entropy perovskite oxides; Hysteresis; Relaxor properties; Strain
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2024.150823

•High-entropy perovskite oxides have been utilized to modulate strain properties of BT ceramics.•Phase structure transitions from tetragonal to pseudocubic with the increase of high-entropy perovskite oxide content.•The distortion of crystal structure is enhanced by lattice distortion effect.•Large strain (0.28 %) with ultra-low hysteresis (4 %) is achieved due to the formation of PNRs by doping BSYAFG. (1 − x)BaTiO3–xBi(Sc0.2Y0.2Al0.2Fe0.2Ga0.2)O3 (BT–BSYAFG, x  = 0.02, 0.04, 0.06, 0.08, and 0.10) ceramics were successfully prepared via the solid-state reaction method. X-ray diffraction and Raman spectroscopy results reveal that a structural transition from the tetragonal (P4mm) to the pseudocubic (Pm3¯m) phase occurs with increasing x. At x  = 0.04 and 0.06, the tetragonal and pseudocubic phases coexist. The relaxor behavior of the as-prepared samples is enhanced via BSYAFG doping due to the lattice distortion effect of high-entropy perovskite oxides. Additionally, the transition from the classic ferroelectric to the relaxor ferroelectric state implies that the long-range-ordered macro-domains are completely transformed into disordered polar nano-regions, which improves the strain properties. A large strain response (0.28 %) with an ultra-low hysteresis (4 %) is achieved at x  = 0.06 under an electric field of 70 kV/cm. These results indicate that BT–BSYAFG ceramics are promising materials for application to the field of precision actuators.