Effect of yttrium doping on the structure, dielectric multiferroic and magnetodielectric properties of Bi 5 Ti 3 FeO 15
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Effect of yttrium doping on the structure, dielectric multiferroic and magnetodielectric properties of Bi5Ti3FeO15 ceramics Jingwei Li1 · Yongping Pu1 · Xiaoying Wang1 · Yu Shi1 · Ruike Shi1 · Mengdie Yang1 · Wen Wang1 · Xu Guo1 · Xin Peng1 Received: 16 October 2019 / Accepted: 27 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Multiferroic Bi5−xYxTi3FeO15 (BYTF-x, x = 0, 0.1, 0.3, 0.5, 0.7) ceramics were synthesized through the conventional solidstate reaction. The structure, dielectric, multiferroic and magnetodielectric properties of BYTF-x were investigated in detail. X-ray diffraction confirmed that all the samples were layered Aurivillius structure. Upon increasing Y content, the grain size of samples slightly decreases. The dielectric permittivity increased with Y doped. The Y doping has no effect on microstructural changes of plate-like grains which verified though field-emission scanning electron microscopy. The minimum remanent polarization (2Pr = 2.48 μc/cm2) was observed in BYTF-0.3 ceramic and the maximum magnetodielectric coefficient value of 1.23% was obtained in BYTF-0.3 ceramic perhaps result from the coexistence of Fe2+ and F e3+. Additionally, weak ferromagnetic is only found in BYTF-0.3 ceramic. The ferromagnetism can be attributed to ferromagnetic double exchange interactions (Fe2+–O–Fe3+) and the spin canting of tilting F eO6 octahedra via the Dzyaloshinskii–Moriya interaction. These results indicate that Y doping Aurivillius phase may be the potential candidates for exploring superior room-temperature multiferroics.
1 Introduction Multiferroic materials, which coexist ferroelectric and ferromagnetic orders, have drawn extensive attentions in the last few years because of its potential applications in magnetic sensors, electronics, data storage devices and energy-harvesting elements [1–3]. Additionally, the coupling between ferromagnetism and ferroelectricity in multiferroics can produce considerable attractive phenomena, such as the magnetodielectric (MD) effect and magnetoelectric (ME) effect [4]. In order to expand the potential applications of multiferroics, various single-phase multiferroic materials including BiFeO3 [5], BaFe12O19 [6] and BiMnO3 have been studied by researchers. However, the large leakage current and antiferromagnetic (AFM) nature of BiFeO3 exacerbate its coupling strength; the application temperature and the * Yongping Pu [email protected] 1
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, People’s Republic of China
application suitability are the main limitations for B aFe12O19 and BiMnO3 in practical application. Recently, a general formula ( Bi2O2)2+(An−1BnO3n+1)2− named Aurivillius phase which is a family of layered Bi-containing oxides gets substantial attention. The (Bi2O2)2+ plays an important role in the Aurivillius structure for the funct
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