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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]
Copyright of Physica B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 60159901
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Complex impedance spectroscopy studies of (La<subscript>0.70−x </subscript>Nd<subscript> x </subscript>)Sr<subscript>0.30</subscript>Mn<subscript>0.70</subscript>Cr<subscript>0.30</subscript>O<subscript>3</subscript> (x≤0.30) perovskite compounds
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Kallel%2C+Sami%22">Kallel, Sami</searchLink><relatesTo>1</relatesTo><i> sami_kallel@yahoo.fr</i><br /><searchLink fieldCode="AR" term="%22Nasri%2C+Ammar%22">Nasri, Ammar</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kallel%2C+Nabil%22">Kallel, Nabil</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rahmouni%2C+Hedi%22">Rahmouni, Hedi</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Peña%2C+Octavio%22">Peña, Octavio</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Khirouni%2C+Kamel%22">Khirouni, Kamel</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Oumezzine%2C+Mohamed%22">Oumezzine, Mohamed</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Physica+B%22">Physica B</searchLink>. May2011, Vol. 406 Issue 11, p2172-2176. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br /><searchLink fieldCode="DE" term="%22Impedance+spectroscopy%22">Impedance spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Semiconductor+doping%22">Semiconductor doping</searchLink><br /><searchLink fieldCode="DE" term="%22Hopping+conduction%22">Hopping conduction</searchLink><br /><searchLink fieldCode="DE" term="%22Polarons%22">Polarons</searchLink><br /><searchLink fieldCode="DE" term="%22Activation+%28Chemistry%29%22">Activation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Relaxation+phenomena%22">Relaxation phenomena</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+grain+boundaries%22">Crystal grain boundaries</searchLink>
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  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Physica B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.physb.2011.03.025
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 5
        StartPage: 2172
    Subjects:
      – SubjectFull: Perovskite
        Type: general
      – SubjectFull: Impedance spectroscopy
        Type: general
      – SubjectFull: Semiconductor doping
        Type: general
      – SubjectFull: Hopping conduction
        Type: general
      – SubjectFull: Polarons
        Type: general
      – SubjectFull: Activation (Chemistry)
        Type: general
      – SubjectFull: Relaxation phenomena
        Type: general
      – SubjectFull: Crystal grain boundaries
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    Titles:
      – TitleFull: Complex impedance spectroscopy studies of (La0.70−x Nd x )Sr0.30Mn0.70Cr0.30O3 (x≤0.30) perovskite compounds
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              M: 05
              Text: May2011
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              Y: 2011
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