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Enhanced Multiferroic and Magnetocapacitive Properties of (1 − x)Ba0.7Ca0.3TiO3xBiFeO3 Ceramics

Authors

  • Cai-Xia Li,

    1. Department of Physics, Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin, China
    2. Department of Material Physics, School of Applied Sciences, Harbin University of Science and Technology, Harbin, China
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  • Bin Yang,

    Corresponding author
    1. Department of Physics, Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin, China
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  • Shan-Tao Zhang,

    1. Department of Materials Science and Engineering, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, China
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  • Rui Zhang,

    1. Department of Physics, Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin, China
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  • Ye Sun,

    1. Department of Physics, Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin, China
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  • Hong-Jun Zhang,

    1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, China
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  • Wen-Wu Cao

    Corresponding author
    1. Department of Physics, Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin, China
    2. Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania
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Abstract

The structures, Curie temperature, dielectric relaxor behaviors, ferroelectricity, ferromagnetism, and magnetocapacitance of the (1−x)Ba0.70Ca0.30TiO3xBiFeO3 [(1−x)BCT–xBF, x = 0–0.90] solid solutions have been systematically investigated. The ceramics have coexisted tetragonal (T) and orthorhombic (O) phases when x ≤ 0.06, coexisted pseudocubic (PC) and O phases when x = 0.065, coexisted cubic and O phases when 0.07 ≤  0.12, PC phase when 0.21 ≤  0.42, coexisted T and rhombohedral (R) phases when 0.52 ≤  0.70, and R phase when  0.75. Significantly, composition-dependent microstructures and Curie temperature are observed, the average grain size increases from 1.9 μm for = 0, reaches 12.0 μm for = 0.67, and then decreases to 1.3 μm for = 0.90. At room temperature, the ceramics with = 0.42–0.70 show piezoelectric properties and multiferroic behaviors, characterized by the polarization-electric field, polarization current intensity–electric field, and magnetization–magnetic field curves, the composition with = 0.67 has maximum polarization, remnant polarization, maximum magnetization, and remnant magnetization of 15.0 μC/cm2, 9.1 μC/cm2, 0.33 emu/g, and 0.14 emu/g, respectively. In addition, the magnetocapacitance is evidenced by the increased relative dielectric constant with increasing the applied magnetic field (H). With ΔH = 8 kOe, the composition with = 0.67 shows the largest values of (εr(H) − εr(0))/εr(0) = 2.96% at room temperature. The structure–property relationship is discussed intensively.

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