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- Title
Impedance spectroscopy study of TiO<sub>2</sub> addition on the ceramic matrix Na<sub>2</sub>Nb<sub>4</sub>O<sub>11</sub>.
- Authors
Romeu, M. C.; Oliveira, R. G. M.; Sales, A. J. M.; Silva, P. M. O.; Filho, J. M. S.; Costa, M. M.; Sombra, A. S. B.
- Abstract
In this paper a study of TiO 2 addition (0, 2, 5 and 10 wt%) and its effects in the impedance spectra of Na 2Nb 4O 11 ceramic matrix was carried out. The structural, dielectric properties of the addition in the Na 2Nb 4O 11 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 TiO 2, 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.
- Subjects
TITANIUM dioxide; CERAMIC metals; IMPEDANCE spectroscopy; SODIUM compounds; ADDITION reactions; CRYSTAL structure
- Publication
Journal of Materials Science: Materials in Electronics, 2013, Vol 24, Issue 12, p4993
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-013-1514-6