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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]
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Database: Engineering Source
Description
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]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.03.282