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Structural evolution, dielectric response and charge transport mechanism in La3+ modified Gd1-xLaxMn0.5Fe0.5O3 perovskites.

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Title: Structural evolution, dielectric response and charge transport mechanism in La3+ modified Gd1-xLaxMn0.5Fe0.5O3 perovskites.
Authors: Parida, Siddhartha Swarup1 (AUTHOR), Kumar, Abhijeet1 (AUTHOR), Sinha, Udit Kumar1 (AUTHOR), Singh, Budhendra1 (AUTHOR) budhendrasingh@cusb.ac.in
Source: Ceramics International. May2026:Part B, Vol. 52 Issue 13, p22149-22162. 14p.
Subjects: Lanthanum compounds, Sol-gel processes, Orthorhombic crystal system, Charge transfer, Permittivity
Abstract: Gd 1-x La x Mn 0.5 Fe 0.5 O 3 (GLMFO- x) mixed B-site perovskite ceramic was synthesised using modified sol-gel technique and sintered at 800 °C to investigate the influence of La3+ incorporation on its structural, dielectric and charge transport behaviour in a wide temperature and frequency range. Rietveld refinement confirmed the formation of an orthorhombic (pbnm) phase with La3+ incorporation within the solubility limit. La-modification showed an enhanced thermally activated relaxation and charge retention, as evidenced by increased relaxation activation energies and longer relaxation times when compared to the undoped composition. Additionally, La3+ substitution confirmed for a drastic suppression in temperature and frequency dependence of the dielectric constant, thus, suggesting a significantly improved dielectric stability over a wide temperature and frequency range. Moreover, the investigation of hopping lengths and conductivity behaviour suggested a small-polaron transport mechanism for all the samples, which is consistent with Mott's variable-range hopping mechanism. The results suggest La3+-modified GLMFO- x ceramics as promising lead-free alternatives for high-frequency microelectronic and capacitive device applications. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics International 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.)
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DbLabel: Engineering Source
An: 193683803
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  Data: Structural evolution, dielectric response and charge transport mechanism in La3+ modified Gd1-xLaxMn0.5Fe0.5O3 perovskites.
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  Data: <searchLink fieldCode="JN" term="%22Ceramics+International%22">Ceramics International</searchLink>. May2026:Part B, Vol. 52 Issue 13, p22149-22162. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Lanthanum+compounds%22">Lanthanum compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Sol-gel+processes%22">Sol-gel processes</searchLink><br /><searchLink fieldCode="DE" term="%22Orthorhombic+crystal+system%22">Orthorhombic crystal system</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+transfer%22">Charge transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Permittivity%22">Permittivity</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Gd 1-x La x Mn 0.5 Fe 0.5 O 3 (GLMFO- x) mixed B-site perovskite ceramic was synthesised using modified sol-gel technique and sintered at 800 °C to investigate the influence of La3+ incorporation on its structural, dielectric and charge transport behaviour in a wide temperature and frequency range. Rietveld refinement confirmed the formation of an orthorhombic (pbnm) phase with La3+ incorporation within the solubility limit. La-modification showed an enhanced thermally activated relaxation and charge retention, as evidenced by increased relaxation activation energies and longer relaxation times when compared to the undoped composition. Additionally, La3+ substitution confirmed for a drastic suppression in temperature and frequency dependence of the dielectric constant, thus, suggesting a significantly improved dielectric stability over a wide temperature and frequency range. Moreover, the investigation of hopping lengths and conductivity behaviour suggested a small-polaron transport mechanism for all the samples, which is consistent with Mott's variable-range hopping mechanism. The results suggest La3+-modified GLMFO- x ceramics as promising lead-free alternatives for high-frequency microelectronic and capacitive device applications. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Ceramics International 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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        Value: 10.1016/j.ceramint.2026.03.282
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Sol-gel processes
        Type: general
      – SubjectFull: Orthorhombic crystal system
        Type: general
      – SubjectFull: Charge transfer
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      – SubjectFull: Permittivity
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      – TitleFull: Structural evolution, dielectric response and charge transport mechanism in La3+ modified Gd1-xLaxMn0.5Fe0.5O3 perovskites.
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            NameFull: Kumar, Abhijeet
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              Text: May2026:Part B
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              Y: 2026
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