Large enhancement of properties in strained lead-free multiferroic solid solutions with strong deviation from Vegard's law

Wang, T and Zou, M-J and Zhang, D and Ku, Y-C and Zheng, Y and Pan, S and Ren, Z and Xu, Z and Huang, H and Luo, W and Tang, Y and Chen, L and Liu, C-E and Chang, C-F and Das, S and Bellaiche, L and Yang, Y and Ma, X-L and Kuo, C-Y and Liu, X and Chen, Z (2024) Large enhancement of properties in strained lead-free multiferroic solid solutions with strong deviation from Vegard's law. In: Matter .

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Abstract

Efforts to combine the advantages of multiple systems to enhance functionalities through solid-solution design present a great challenge due to the constraint imposed by the classical Vegard's law. Here, we successfully navigate this trade-off by leveraging the synergistic effect of chemical doping and strain engineering in the solid-solution system of (1-x)BiFeO3-xBaTiO3. Unlike bulks, a significant deviation from Vegard's law accompanied by enhanced multiferroism is observed in strained solid-solution epitaxial films, where we achieve a pronounced tetragonality (�1.1), enhanced saturated magnetization (�12 emu/cm3), substantial polarization (�107 μC/cm2), and high ferroelectric Curie temperature (�880°C), all while maintaining impressively low leakage current. These characteristics surpass the properties of their parent BiFeO3 and BaTiO3 films. Moreover, the superior ferroelectricity has never been reported in corresponding bulks (e.g., P �5 μC/cm2 and TC �300°C for bulk, with x = 0.5). These findings underscore the potential of strained (1-x)BiFeO3-xBaTiO3 films as lead-free, room temperature multiferroics. © 2024 Elsevier Inc.

Item Type:	Journal Article
Publication:	Matter
Publisher:	Cell Press
Additional Information:	The copyright for this article belongs to Cell Press
Keywords:	Barium titanate; Doping (additives); Epitaxial films; Ferroelectric films; Germanium compounds; Leakage currents, BaTiO 3; BiFeO3-BaTiO3; Epitaxial strain; Lead-Free; MAP 1: discovery; Multiferroics; Multiple systems; Property; Solution designs; Vegard's law, Ferroelectricity
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	18 Nov 2024 17:36
Last Modified:	18 Nov 2024 17:36
URI:	http://eprints.iisc.ac.in/id/eprint/86835

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