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Crystal Structure, Magnetic and Electrical Properties of Half-Doped Chromium Manganite La0.5Sr0.5Mn0.5Cr0.5O3.

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Title: Crystal Structure, Magnetic and Electrical Properties of Half-Doped Chromium Manganite La0.5Sr0.5Mn0.5Cr0.5O3.
Authors: Kallel, Nabil1,2 (AUTHOR) kallel_nabil@yahoo.fr, Hazzez, Mohamed1 (AUTHOR), Ihzaz, Nejib1 (AUTHOR)
Source: Journal of Superconductivity & Novel Magnetism. Aug2019, Vol. 32 Issue 8, p2623-2631. 9p.
Subject Terms: *Crystal structure, *Magnetic properties, *Rietveld refinement, *Manganite, *Magnetic measurements, *Manganese alloys
Abstract: Polycrystalline sample La0.5Sr0.5Mn0.5Cr0.5O3 (LSMCO) was prepared by a conventional solid-state reaction method in the air, and its structure was determined by Rietveld refinement using consistent resolution time-of-flight X-ray diffraction. Different structural models have been used for analysis of X-ray diffraction data recorded at room temperature, but the best fits have been found using a mixture of rhombohedral and an orthorhombic structural phases (42(1)%/57(1)%). The rhombohedral, centro-symmetric space group R 3 ¯ c No. 167 a ≈ 2 a p c ≈ 2 3 a p Z = 6 with octahedral tilting scheme a−a−a− leading to a three identical out-of-phase tilt angle of (Mn/Cr)-O6 octahedron along three perovskite main directions: x, y, and z-axes. The orthorhombic space group Pbnm No. 62 a ≈ b ≈ 2 a p c ≈ 2 a p Z = 4 with octahedral tilting scheme a−a−c+, leads to an anti-phase tilts of the same magnitude about [100] and [010] directions of the elementary specimen cell and in-phase tilt of different magnitude about the [001] direction. At low temperature 10 K, Rietveld refinement of powder diffraction data revealed that the crystal structure of sample is distorted with a single orthorhombic symmetry (space group Pbnm). Magnetic measurements indicate that our investigated sample exhibits an overall anti-ferromagnetic behavior mainly attributed to the frustration induced by both competing AFM Cr3+-O-Cr3+, Mn4+-O-Mn4+ networks, and the mixed one Mn4+-O-Cr3+exchange magnetic interactions. The temperature dependence of the resistivity measured under zero field shows a semi-conducting behavior in the whole temperature range, which probably could be described by the adiabatic small polaron hoping model with relatively high polaron activation energy. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Crystal Structure, Magnetic and Electrical Properties of Half-Doped Chromium Manganite La<subscript>0.5</subscript>Sr<subscript>0.5</subscript>Mn<subscript>0.5</subscript>Cr<subscript>0.5</subscript>O<subscript>3</subscript>.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Kallel%2C+Nabil%22">Kallel, Nabil</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> kallel_nabil@yahoo.fr</i><br /><searchLink fieldCode="AR" term="%22Hazzez%2C+Mohamed%22">Hazzez, Mohamed</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ihzaz%2C+Nejib%22">Ihzaz, Nejib</searchLink><relatesTo>1</relatesTo> (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Journal+of+Superconductivity+%26+Novel+Magnetism%22">Journal of Superconductivity & Novel Magnetism</searchLink>. Aug2019, Vol. 32 Issue 8, p2623-2631. 9p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Crystal+structure%22">Crystal structure</searchLink><br />*<searchLink fieldCode="DE" term="%22Magnetic+properties%22">Magnetic properties</searchLink><br />*<searchLink fieldCode="DE" term="%22Rietveld+refinement%22">Rietveld refinement</searchLink><br />*<searchLink fieldCode="DE" term="%22Manganite%22">Manganite</searchLink><br />*<searchLink fieldCode="DE" term="%22Magnetic+measurements%22">Magnetic measurements</searchLink><br />*<searchLink fieldCode="DE" term="%22Manganese+alloys%22">Manganese alloys</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Polycrystalline sample La0.5Sr0.5Mn0.5Cr0.5O3 (LSMCO) was prepared by a conventional solid-state reaction method in the air, and its structure was determined by Rietveld refinement using consistent resolution time-of-flight X-ray diffraction. Different structural models have been used for analysis of X-ray diffraction data recorded at room temperature, but the best fits have been found using a mixture of rhombohedral and an orthorhombic structural phases (42(1)%/57(1)%). The rhombohedral, centro-symmetric space group R 3 ¯ c No. 167 a ≈ 2 a p c ≈ 2 3 a p Z = 6 with octahedral tilting scheme a−a−a− leading to a three identical out-of-phase tilt angle of (Mn/Cr)-O6 octahedron along three perovskite main directions: x, y, and z-axes. The orthorhombic space group Pbnm No. 62 a ≈ b ≈ 2 a p c ≈ 2 a p Z = 4 with octahedral tilting scheme a−a−c+, leads to an anti-phase tilts of the same magnitude about [100] and [010] directions of the elementary specimen cell and in-phase tilt of different magnitude about the [001] direction. At low temperature 10 K, Rietveld refinement of powder diffraction data revealed that the crystal structure of sample is distorted with a single orthorhombic symmetry (space group Pbnm). Magnetic measurements indicate that our investigated sample exhibits an overall anti-ferromagnetic behavior mainly attributed to the frustration induced by both competing AFM Cr3+-O-Cr3+, Mn4+-O-Mn4+ networks, and the mixed one Mn4+-O-Cr3+exchange magnetic interactions. The temperature dependence of the resistivity measured under zero field shows a semi-conducting behavior in the whole temperature range, which probably could be described by the adiabatic small polaron hoping model with relatively high polaron activation energy. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1007/s10948-019-4997-4
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 9
        StartPage: 2623
    Subjects:
      – SubjectFull: Crystal structure
        Type: general
      – SubjectFull: Magnetic properties
        Type: general
      – SubjectFull: Rietveld refinement
        Type: general
      – SubjectFull: Manganite
        Type: general
      – SubjectFull: Magnetic measurements
        Type: general
      – SubjectFull: Manganese alloys
        Type: general
    Titles:
      – TitleFull: Crystal Structure, Magnetic and Electrical Properties of Half-Doped Chromium Manganite La0.5Sr0.5Mn0.5Cr0.5O3.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Kallel, Nabil
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            NameFull: Hazzez, Mohamed
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            NameFull: Ihzaz, Nejib
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          Dates:
            – D: 01
              M: 08
              Text: Aug2019
              Type: published
              Y: 2019
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              Value: 15571939
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              Value: 32
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              Value: 8
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            – TitleFull: Journal of Superconductivity & Novel Magnetism
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