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Single-phase multiferroic materials of rare-earth orthoferrites with magnetism and ferroelectricity are of great technological importance in storage devices. However, the polarization (P) of these materials is generally weak (0.01 μC·cm−2), and the ferroelectricity is reported to exist below room temperature (25 ℃). Here, (Bi0.2La0.2Y0.2Dy0.2Tb0.2)FeO3 (BLYDTFO) high-entropy oxides that exhibit a saturation P of 5.3 μC·cm−2 at the electric field (E) of 45 kV·cm−1 at room temperature was designed and fabricated by the conventional solid-phase method. The results show that configurational entropy introduces atomic disorder and a larger tilt of BO6 octahedron, which facilitates non-centrosymmetric distortion and ferroelectricity at room temperature compared with other single components (LaFeO3, YFeO3, DyFeO3, and TbFeO3). This high-entropy approach expands the compositional window of the rare-earth orthoferrites to enhance the ferroelectricity in multiferroic applications.


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High-entropy enhanced room-temperature ferroelectricity in rare-earth orthoferrites

Show Author's information Bo NiaAteer BaoaYaohang GuaXiaoyan ZhangbXiwei Qic ( )
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China
College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China

Abstract

Single-phase multiferroic materials of rare-earth orthoferrites with magnetism and ferroelectricity are of great technological importance in storage devices. However, the polarization (P) of these materials is generally weak (0.01 μC·cm−2), and the ferroelectricity is reported to exist below room temperature (25 ℃). Here, (Bi0.2La0.2Y0.2Dy0.2Tb0.2)FeO3 (BLYDTFO) high-entropy oxides that exhibit a saturation P of 5.3 μC·cm−2 at the electric field (E) of 45 kV·cm−1 at room temperature was designed and fabricated by the conventional solid-phase method. The results show that configurational entropy introduces atomic disorder and a larger tilt of BO6 octahedron, which facilitates non-centrosymmetric distortion and ferroelectricity at room temperature compared with other single components (LaFeO3, YFeO3, DyFeO3, and TbFeO3). This high-entropy approach expands the compositional window of the rare-earth orthoferrites to enhance the ferroelectricity in multiferroic applications.

Keywords: ferroelectricity, high-entropy, rare-earth orthoferrites, multiferroic materials

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Publication history

Received: 20 October 2022
Revised: 16 December 2022
Accepted: 01 January 2023
Published: 09 March 2023
Issue date: April 2023

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© The Author(s) 2023.

Acknowledgements

This study was supported by the National Natural Science Foundation of China (No. 51972048).

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