Abstract
A novel ternary solid solution (1-y)((1-x)BiFeO3–xBi0.5Na0.5TiO3)–yCaTiO3 (0 ≤ x ≤ 0.3, 0.15 ≤ y ≤ 0.25) is designed to present a rhombohedral–orthorhombic morphotropic phase boundary (MPB) with enhanced ferroelectricity, canted ferromagnetism, and room-temperature magnetoelectric responses. The addition of Bi0.5Na0.5TiO3 can generate a distinct MPB region and make BiFeO3–CaTiO3-based ceramics more denser. Therefore, superior ferroelectric properties with the remanent polarization of 37µC/cm2 can be obtained in the x = 0.3, y = 0.15 sample with the presence of rhombohedral–orthorhombic MPB. However, weak ferromagnetism is observed in both the rhombohedral and orthorhombic phases due to a destruction of the spiral spin structure of BiFeO3. The MPB with canted ferromagnetism is constructed. The maximum magnetoelectric interaction constant is found in the MPB compositions with x = 0.2, y = 0.2 which is related with the multiferroic phase boundary.
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Acknowledgements
This work was supported by the Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences’ Large-Scale Scientific Facility (Grant No. U1832115), the National Key Research and Development Program of China (2017YFA0403502), the National Natural Science Foundation of China (Grant No. 61904019), and the Natural Science Foundation of universities of Jiangsu Province of China (19KJB140005).
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Huang, W.J., Yang, J.J., Shu, M.F. et al. Room-temperature multiferrocity and magnetodielectric properties of ternary BiFeO3–Bi0.5Na0.5TiO3–CaTiO3 ceramics across the rhombohedral–orthorhombic phase boundary. J Mater Sci: Mater Electron 32, 11524–11535 (2021). https://doi.org/10.1007/s10854-021-05729-5
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DOI: https://doi.org/10.1007/s10854-021-05729-5