Structural, electrical conductance and complex impedance analysis of (Nd1−xCex)0.7Sr0.3MnO3 (0≤x≤0.20) perovskite

Polycrystalline samples of (Nd1−xCex)0.7Sr0.3MnO3 (x=0, 0.10 and 0.20) were prepared by a high-temperature solid-state reaction technique. The X-ray diffraction study has shown that all the samples exhibit a single phase with orthorhombic structure (space group Pnma). From the resistivity data, it i...

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Bibliographic Details
Published in:Ceramics international 2015-03, Vol.41 (2), p.1929-1936
Main Authors: Bellouz, Ridha, Kallel, Sami, Khirouni, Kamel, Pena, Octavio, Oumezzine, Mohamed
Format: Article
Language:English
Subjects:
AC conductivity
Ceramics
Chemical Sciences
Conductance
D. Perovskite
Electrical resistance
Electrical resistivity
Equivalent circuits
Frequency ranges
Impedance
Impedance spectroscopy
Material chemistry
Semiconductors
Transition temperature
X-ray diffraction
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Summary:Polycrystalline samples of (Nd1−xCex)0.7Sr0.3MnO3 (x=0, 0.10 and 0.20) were prepared by a high-temperature solid-state reaction technique. The X-ray diffraction study has shown that all the samples exhibit a single phase with orthorhombic structure (space group Pnma). From the resistivity data, it is found that all the samples show metal to semiconductor transition and the transition temperature decreases with the Ce doping. The complex impedance has been investigated in the temperature range 80–320K and in the frequency range 40Hz–1MHz. AC conductance analyses indicate that the conduction mechanism is strongly dependent on temperature and frequency. The impedance plane plot shows semicircle arcs at different temperatures and an electrical equivalent circuit has been proposed to explain the impedance results. The activation energies obtained from the conductance is slightly higher than that from time relaxation analyses.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2014.10.001