Electrical conductivity and dielectric behavior in sodium zinc divanadates

The Na2ZnV2O7 compound was obtained by the conventional solid-state reaction. The sample was characterized by X-ray powder diffraction, Raman and impedance spectroscopy. The ac electrical conductivity and dielectric properties have been investigated in the frequency and temperature range of 200Hz–1M...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2014-11, Vol.452, p.142-147
Main Authors: Sallemi, F., Louati, B., Guidara, K.
Format: Article
Language:English
Subjects:
AC conductivity
Activation energy
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity
Conductivity phenomena in semiconductors and insulators
Dielectric properties
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Direct current
Electrical conductivity
Electrical resistivity
Electronic transport in condensed matter
Exact sciences and technology
Low-field transport and mobility
piezoresistance
Na2ZnV2O7
Permittivity (dielectric function)
Physics
Resistivity
Thermodynamic parameters
Zinc
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Summary:The Na2ZnV2O7 compound was obtained by the conventional solid-state reaction. The sample was characterized by X-ray powder diffraction, Raman and impedance spectroscopy. The ac electrical conductivity and dielectric properties have been investigated in the frequency and temperature range of 200Hz–1MHz and 513K–729K, respectively. The direct current conductivity process is thermally activated. The frequency dependence of the conductivity is interpreted using the power law. The close values of activation energies obtained from the analysis of hopping frequency and dc conductivity implies that the transport is due to Na+ cation displacement parallel to (001) plane located between ZnO4 and VO4 tetrahedra. The evolution of the complex permittivity as a function of angular frequency was investigated. Several important parameters such as charge carrier concentration, ionic mobility and diffusion coefficient were determined. Thermodynamic parameters such as the free energy of activation ∆F, the enthalpy ∆H, and the change in entropy ∆S have been calculated.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2014.07.016