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Impedance Spectroscopy Study of Bi1.34Fe0.66Nb1.34O6.35 Ceramics

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Abstract

The bismuth-based pyrochlore, Bi1.34Fe0.66Nb1.34O6.35, was prepared by the sol–gel method and synthesized at low temperature. The phase structure and the morphology were studied by x-ray diffraction and scanning electron microscopy. Even with treatments performed at low temperature, the obtained powders showed high crystallinity and nanosized grains. To investigate the dielectric performance, the impedance spectroscopy technique was used in the frequency range of 102-106 Hz, in function of the temperature (200-330 K). The prepared samples presented two temperature-dependent relaxation processes, with the corresponding activation energies being calculated by fitting the experimental data to the Arrhenius model.

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Acknowledgments

Susana Devesa acknowledges the post-doctoral grant under the project “SUSpENsE - CENTRO-01-0145-FEDER-000006”. This work was partially supported by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT—Portuguese Foundation for Science and Technology under the projects UID/CTM/50025/2019 and UID/FIS/04564/2020.

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Authors and Affiliations

  1. CFisUC, Physics Department, University of Coimbra, Rua Larga, 3004-516, Coimbra, Portugal

    S. Devesa

  2. I3N and Physics Department, University of Aveiro, 3810-193, Aveiro, Portugal

    S. Devesa, M. P. Graça & L. C. Costa

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  1. S. Devesa
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  2. M. P. Graça
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  3. L. C. Costa
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Devesa, S., Graça, M.P. & Costa, L.C. Impedance Spectroscopy Study of Bi1.34Fe0.66Nb1.34O6.35 Ceramics. J. Electron. Mater. 50, 4135–4144 (2021). https://doi.org/10.1007/s11664-021-08922-8

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