Impedance spectroscopy study of TiO2 addition on the ceramic matrix Na2Nb4O11
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In this paper a study of TiO2 addition (0, 2, 5 and 10 wt%) and its effects in the impedance spectra of Na2Nb4O11 ceramic matrix was carried out. The structural, dielectric properties of the addition in the Na2Nb4O11 matrix were discussed. In the preliminary structural studies, X-ray diffractograms of the samples were recorded at room temperature with X-ray diffractometer with Cu-kα. The Rietveld refinement method was used and confirmed the monoclinic structure for pure sample. A study based on complex impedance spectroscopy was carried and the dielectric properties were obtained over a frequency range (100 Hz–1 MHz) in room temperature (300 K). In the dielectric analysis at 1 MHz was observed relative permittivity of 99.46 for pure sample and 84.37 to sample added with 5 wt% of TiO2, those samples showed losses 3.55 × 10−2 and 9.22 × 10−2, respectively. In relation to relaxation phenomenon, Cole–Cole function was used for fitting pure and added samples data.
KeywordsTiO2 Pure Sample NaNbO3 Dielectric Analysis TiO2 Addition
The authors thanks the LOCEM (Laboratory of Telecommunications and Materials Science and Engineering) and the departments of physics, Teleinformática and laboratory X-ray of the Federal University of Ceará, Brazil.
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