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|Title:||Investigation of the conductivity of Na2SO4–PbTiO3 composite electrolyte system: Non linear electrical behavior at Curie temperature of the dispersoid|
|Authors:||BOBADE, S M|
|Citation:||Solid State Ionics 178(29-30), 1585-1589|
|Abstract:||The effect of dielectric constant of the PbTiO3 dispersoid on the conductivity of Na2SO4 has been probed. At the Curie temperature, 490 °C, PbTiO3 undergoes ferroelectric to paraelectric phase transition followed by a sharp change in the dielectric constant. The Na2SO4–PbTiO3 composites have been prepared at two different temperatures, namely 600 and 900 °C. Compositions containing 5, 10, 20, 30, 40, 50 m% PbTiO3 have been investigated using Impedance Spectroscopy, Differential Scanning Calorimetry (DSC), X-ray diffraction (XRD) and Rietveld analysis. The series of compositions prepared at 900 °C exhibit a maxima in the conductivity for 20 m% PbTiO3. The composites prepared at 600 °C exhibit a peak in the conductivity at 20 m% PbTiO3 in addition to the percolation threshold at 40 m% PbTiO3. The enhancement in the conductivity by a factor of 40 at 300 °C has been observed for the system prepared at 600 °C while an enhancement in the conductivity by a factor of 8 at 300 °C has been observed for the system prepared at 900 °C. Further, the transition temperature of Na2SO4 remains unaltered for both series. A slight nonlinearity has been observed in the vicinity of the transition temperature of the dispersoid|
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