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Dielectric and Electrical Properties of BiFeO3–LiTaO3 Systems

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Abstract

Materials of general formula (Bi1−x Li x )(Fe1−x Ta x )O3 (x = 0.0, 0.5) were prepared from polycrystalline BiFeO3 and LiTaO3 by solid-state reaction. Analysis of the basic structural properties of the materials by room-temperature x-ray diffraction revealed the formation of single-phase tetragonal crystals for (Bi0.5Li0.5)(Fe0.5Ta0.5)O3. Scanning electron micrographs confirmed the polycrystalline nature of the materials. The microstructure of the materials comprised uniformly distributed grains of unequal size. Studies of the temperature–frequency dependence of dielectric did not reveal any dielectric anomaly or phase transition in the temperature range studied. The presence of hysteresis loops at room temperature confirmed the known ferroelectricity of BiFeO3 and (Bi0.5Li0.5)(Fe0.5Ta0.5)O3. Complex impedance spectroscopic analysis revealed the materials had negative temperature coefficient of resistance (NTCR)-type behavior. The electrical conductivity and relaxation characteristics of the materials suggested the presence of a thermally activated process, and their values suggested the materials had similar types of conductivity and relaxation species. The frequency dependence of the ac conductivity obeyed Jonscher’s universal power law.

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  1. Department of Physics, Institute of Technical Education and Research, S‘O’A University, Bhubaneswar, 751030, India

    Suchismita Mohanty & R.N.P. Choudhary

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  1. Suchismita Mohanty
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Correspondence to Suchismita Mohanty.

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Mohanty, S., Choudhary, R. Dielectric and Electrical Properties of BiFeO3–LiTaO3 Systems. J. Electron. Mater. 44, 2359–2368 (2015). https://doi.org/10.1007/s11664-015-3789-2

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