Authors: M C Romeu R G M Oliveira A J M Sales P M O Silva J M S Filho M M Costa A S B Sombra
Publish Date: 2013/10/09
Volume: 24, Issue: 12, Pages: 4993-4999
Abstract
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 Xray diffractograms of the samples were recorded at room temperature with Xray diffractometer with Cukα 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 9946 for pure sample and 8437 to sample added with 5 wt of TiO2 those samples showed losses 355 × 10−2 and 922 × 10−2 respectively In relation to relaxation phenomenon Cole–Cole function was used for fitting pure and added samples data
Keywords: