Impedance spectroscopy analysis of an FeNbO4 matrix with different additions of TiO2 and the effects of temperature variation

In this work, investigations of the FeNbO 4 ceramic matrix (FNO) and TiO 2 additions were carried out in 0, 20, 40, 60, and 80% wt. proportions. The material was synthesized using the solid-state reaction method in an energy mill, and the phases were confirmed by X-ray diffraction and Rietveld refin...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2021-03, Vol.32 (5), p.5936-5944
Main Authors: Bezerra Junior, M. H., Abreu, T. O., do Carmo, F. F., de Morais, J. E. V., Oliveira, R. G. M., Silva, M. A. S., de Andrade, H. D., Queiroz Junior, I. S., Mota, J. C. M., Sombra, A. S. B.
Format: Article
Language:English
Subjects:
Activation energy
Characterization and Evaluation of Materials
Chemistry and Materials Science
Dielectric properties
Electrical impedance
Investigations
Materials Science
Mathematical analysis
Optical and Electronic Materials
Spectrum analysis
Temperature
Temperature effects
Titanium dioxide
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Summary:In this work, investigations of the FeNbO 4 ceramic matrix (FNO) and TiO 2 additions were carried out in 0, 20, 40, 60, and 80% wt. proportions. The material was synthesized using the solid-state reaction method in an energy mill, and the phases were confirmed by X-ray diffraction and Rietveld refinement. The study of complex electrical impedance was carried out using real and imaginary impedance, with measurements such as permittivity, conductivity, activation energy, and complex impedance diagrams in the range from 1 Hz to 1 MHz and with temperature variation from 100 to 300 ºC using a Solartron 1260 impedance analyzer. Furthermore, the temperature coefficients of capacitance for the FNO matrix and its additions were also studied. The complex impedance diagrams showed a non-Debye type relaxation, where the adjustments made showed a good relationship between the experimental and simulated results, and the conduction process was thermally activated, following the Arrhenius relation, where the activation energies calculated were 0.46 and 0.53 eV for the FNO sample, calculated by the displacement of the maximum impedance peak and by the conductivity with temperature variation at 1 Hz. The results showed a greater understanding of the conduction processes of the FNO-TiO 2 composite.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-021-05314-w