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Sol–gel synthesis, characterization and dielectric properties of Bi1−x La x FeO3

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Abstract

Bi1−x La x FeO3 (x = 0.05, 0.1, 0.15 and 0.2) powders and ceramics were prepared by a polyvinyl alcohol (PVA) sol–gel route. Differential scanning calorimetry and thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy and environmental scanning electron microscope were used to characterize the precursors, the derived oxide powders and sintered ceramics. Single-phase Bi1−x La x FeO3 powders were obtained at a temperature as low as 500 °C for 2 h, without the formation of any intermediate phase. All samples were found to be rhombohedrally distorted perovskite structure with a space group of R3c. The effect of La substitution on the dielectric properties of Bi1−x La x FeO3 ceramics was studied over the frequency range of 10 kHz–1 MHz. The real part of permittivity of Bi1−x La x FeO3 samples decreased with the increase of La content. The remnant magnetization M r and coercive field H c increase with La doping content. A H c of as high as 2 × 106 A/m was obtained for Bi0.8La0.2FeO3.

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Acknowledgments

This work was supported by the Natural Science Foundation of China under Grant Numbers 61401152 and 10975055. The authors wish to acknowledge the Analytical and Testing Center in Huazhong University of Science and Technology for XRD, ESEM, Raman and FT-IR analysis.

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Correspondence to Yebin Xu.

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Feng, Z., He, Z., Liu, B. et al. Sol–gel synthesis, characterization and dielectric properties of Bi1−x La x FeO3 . J Sol-Gel Sci Technol 75, 134–140 (2015). https://doi.org/10.1007/s10971-015-3683-7

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  • DOI: https://doi.org/10.1007/s10971-015-3683-7

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