Structural, piezoelectric and magnetoelectric properties in 0.65BiFeO3–0.35[(1 − x)Bi0.5K0.5TiO3 − xBaTiO3)] solid solutions

• Published in: Journal of materials science. Materials in electronics 2023-10, Vol.34 (30), p.2009, Article 2009
• Main Authors: Dong, Wei, Zhao, Gaochao, Lei, Xie, Tong, Peng, Yang, Jie, Zhu, Xuebin, Song, Wenhai, Yin, Li-hua, Sun, Yuping
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Characterization and Evaluation of Materials; Chemistry and Materials Science; Electric fields; Ferroelectricity; Magnetic properties; Materials Science; Morphology; Optical and Electronic Materials; Phase transitions; Physics; Piezoelectricity; Room temperature; Solid solutions; Temperature
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-023-11439-x

We report the structural, piezoelectric, multiferroic and magnetoelectric (ME) properties of the ternary 0.65BiFeO 3 –0.35[(1 −  x )Bi 0.5 K 0.5 TiO 3  −  x BaTiO 3 ] (0.0 ≤  x  ≤ 1.0) (BF–BKT–BT) solid solutions. These samples show a rhombohedral to pseudo-cubic structure transition in the vicinity of x  ~ 0.4, i.e., the morphotropic phase boundary (MPB), where the maximum piezoelectric coefficient d 33 occurs. In addition, maximum electric-field (E) induced strain is also observed for x  ~ 0.4 near the MPB. All the samples show good ferroelectricity and basically antiferromagnets at room temperature. The room-temperature E control of magnetization, i.e., converse ME effect, increases with increasing x , reaches a maximum near x  = 0.6, and decreases again with x  ≥ 0.8. In-situ X-ray diffraction studies at different applied E demonstrate an important role of E-induced variation in the phase fraction, Fe–O bond length and Fe–O–Fe bond angle in the converse ME effect. These results reveal a possible effective route to obtain multi-functional devices with both good piezoelectricity and ME effect in the BF–BKT–BT based systems.