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Complex impedance spectroscopy studies of (La0.70−x Nd x )Sr0.30Mn0.70Cr0.30O3 (x≤0.30) perovskite compounds

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Title: Complex impedance spectroscopy studies of (La0.70−x Nd x )Sr0.30Mn0.70Cr0.30O3 (x≤0.30) perovskite compounds
Authors: Kallel, Sami1 sami_kallel@yahoo.fr, Nasri, Ammar1, Kallel, Nabil1, Rahmouni, Hedi2, Peña, Octavio3, Khirouni, Kamel2, Oumezzine, Mohamed1
Source: Physica B. May2011, Vol. 406 Issue 11, p2172-2176. 5p.
Subjects: Perovskite, Impedance spectroscopy, Semiconductor doping, Hopping conduction, Polarons, Activation (Chemistry), Relaxation phenomena, Crystal grain boundaries
Abstract: Abstract: The transport properties of Nd-doped perovskite materials (La0.7−x Nd x )Sr0.3Mn0.7Cr0.3O3 (x≤0.30) were investigated using impedance spectroscopy techniques over a wide range of temperatures and frequencies. AC conductance analyses indicate that the conduction mechanism is strongly dependent on temperature and frequency. The DC conductance plots can be described using the small polaron hopping (SPH) model, with an apparent reduction of the polaron activation energy below the Curie temperature T C. Complex impedance plots exhibit semicircular arcs described by an electrical equivalent circuit. Off-centered semicircular impedance plots show that the Nd-doped compounds obey to a non-Debye relaxation process. The conductivity of grains and grain-boundaries has been estimated. The activation energies calculated from the conductance and from time relaxation analyses are comparable. This indicates that the same type of charge carriers is responsible for both the electrical conduction and relaxation phenomena. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: The transport properties of Nd-doped perovskite materials (La0.7−x Nd x )Sr0.3Mn0.7Cr0.3O3 (x≤0.30) were investigated using impedance spectroscopy techniques over a wide range of temperatures and frequencies. AC conductance analyses indicate that the conduction mechanism is strongly dependent on temperature and frequency. The DC conductance plots can be described using the small polaron hopping (SPH) model, with an apparent reduction of the polaron activation energy below the Curie temperature T C. Complex impedance plots exhibit semicircular arcs described by an electrical equivalent circuit. Off-centered semicircular impedance plots show that the Nd-doped compounds obey to a non-Debye relaxation process. The conductivity of grains and grain-boundaries has been estimated. The activation energies calculated from the conductance and from time relaxation analyses are comparable. This indicates that the same type of charge carriers is responsible for both the electrical conduction and relaxation phenomena. [Copyright &y& Elsevier]
ISSN:09214526
DOI:10.1016/j.physb.2011.03.025