Abstract
Single-phase multiferroic materials of rare-earth orthoferrites with magnetism and ferroelectricity are of great technological importance in storage devices. However, the polarization of these materials is generally weak (0.01 μC×cm<sup>−2</sup>), and the ferroelectricity is reported to exist below room temperature. Here, (Bi<sub>0.2</sub>La<sub>0.2</sub>Y<sub>0.2</sub>Dy<sub>0.2</sub>Tb<sub>0.2</sub>)FeO<sub>3 </sub>(BLYDTFO) high entropy oxide that exhibits a saturation polarization of 5.3 μC×cm<sup>−2</sup> at the electric field of 45 kV×cm<sup>−1</sup> at room temperature was designed and fabricated by the conventional solid phase method. The results show that the configurational entropy introduces atomic disorder and a larger tilt of BO<sub>6</sub> octahedron, which facilitates a non-centrosymmetric distortion and ferroelectricity at room temperature compared with other single components (LaFeO<sub>3</sub>, YFeO<sub>3</sub>, DyFeO<sub>3</sub>, and TbFeO<sub>3</sub>). This high-entropy approach expands the compositional window of rare-earth orthoferrites to enhance ferroelectricity in multiferroic applications.
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