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High-temperature complex impedance and modulus spectroscopic studies of doped Na0.5Bi0.5TiO3-BaTiO3 ferroelectric ceramics

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Abstract

Lead-free Na0.5Bi0.5TiO3 (NBT) and (1 − x)Na0.5Bi0.5TiO3 + xBaTiO3 with x = 0.1 and 0.2 (where x = 0.1 and 0.2 are named as NBT1 and NBT2, respectively), (1 − y)Na0.5Bi0.5TiO3 + yBa0.925Nd0.05TiO3 with y = 0.1 and 0.2 (where y = 0.1 and 0.2 are named as NBT3 and NBT4, respectively)-based relaxor ferroelectric ceramics were prepared using the sol-gel method. The crystal structure was investigated by X-ray diffraction (XRD) at room temperature (RT). The XRD patterns confirmed the presence of the rhombohedral phase in all the samples. The electrical properties of the present NBT-based samples were investigated by complex impedance and the modulus spectroscopy technique in the temperature range of RT–600 °C. The AC conductivity was found to increase with the substitution of Ba2+ ions to the NBT sample whereas it significantly decreased with the addition of Nd3+ ions. The more anion vacancies in Ba-added samples and the lower anion vacancies in Nd-added samples were found to be responsible for higher and lower conductivities, respectively.

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Acknowledgments

The authors are grateful to the Department of Science and Technology (DST), New Delhi, India, for providing the financial assistance.

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Authors and Affiliations

  1. Department of Physics, Osmania University, Hyderabad, 500 007, India

    Ch Sameera Devi, G. S. Kumar & G. Prasad

  2. International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur, Hyderabad, India

    M. Buchi Suresh

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  1. Ch Sameera Devi
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  2. M. Buchi Suresh
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  3. G. S. Kumar
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  4. G. Prasad
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Correspondence to G. Prasad.

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Devi, C.S., Suresh, M.B., Kumar, G.S. et al. High-temperature complex impedance and modulus spectroscopic studies of doped Na0.5Bi0.5TiO3-BaTiO3 ferroelectric ceramics. Ionics 22, 2363–2377 (2016). https://doi.org/10.1007/s11581-016-1781-3

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  • DOI: https://doi.org/10.1007/s11581-016-1781-3

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