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Trigui W.,Laboratoire Of Letat Solide | Oueslati A.,Laboratoire Of Letat Solide | Chaabane I.,Laboratoire Of Letat Solide | Corbel G.,CNRS Le Mans Institute of Molecules and Materials | Hlel F.,Laboratoire Of Letat Solide
Applied Physics A: Materials Science and Processing | Year: 2015

The tri-tetrapropylammonium dodeca chlorobismuthate(III) has been characterized by differential scanning calorimetry (DSC), X-ray powder and impedance spectroscopy. DSC analysis and X-ray diffraction as function of temperature have revealed one irreversible solid–solid phase transition at 414 ± 5 K of order–disorder types. The electrical properties were studied using impedance spectroscopy at different temperatures in the frequency range of 209 Hz–5 MHz. The obtained results were analyzed by fitting the experimental data with the equivalent electrical circuit. We observed that the temperature dependence of the electrical conductivity of materials exhibits a crossover from T−1/4 to T−1 dependence in the temperature range between 414 and 453 K. Furthermore, the modulus plots can be characterized by the non-experiential decay function φt=exp-tτβ. The analysis of the experimental data based on the jump relaxation model has shown that the translation motion of the charge carrier and reorientation hopping between the equivalent sites of the metal chloride [Bi3Cl12]3− anions and the [(C3H7)4N]+ cations are responsible for the observed ac conductivity. © 2015, Springer-Verlag Berlin Heidelberg. Source


Makram M.,Laboratoire Of Letat Solide | Mahmoud H.,Laboratoire Of Letat Solide | Louati B.,Laboratoire Of Letat Solide | Hlel F.,Laboratoire Of Letat Solide | Guidara K.,Laboratoire Of Letat Solide
Ionics | Year: 2010

NaAgPbP2O7 was prepared with a solid-state reaction. The electrical properties were investigated by using impedance measurements in the frequency range from 200 Hz to 5 MHz with the TEGAM 3550 ALF automatic bridge monitored by a microcomputer between 581 K and 703 K. The Z′ and Z″ versus frequency plots are well fitted to an equivalent circuit model. The conductivity data obey the universal power law. The conductivity in the material is due to the hopping of monovalent ions parallel to (001) plane. © 2010 Springer-Verlag. Source

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