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<p>Sm3<sup> + </sup>-doped magnesium ferrite (Mg<sub>1−x</sub>Fe<sub>2</sub>O<sub>4</sub>:xSm) samples were synthesised via the solution combustion method, with doping concentrations of x = 0.0, 0.2, 0.4, and 0.6&#xa0;mol %. The structural analysis by XRD confirmed a cubic structure with the Fd-3&#xa0;m space group and the average crystallite size was 36&#xa0;nm. FT-IR spectra displayed two absorption bands (ν1 and ν2) attributed to tetrahedral and octahedral site vibrations. SEM analysis of the microstructure revealed that all samples exhibited agglomeration, whilst EDX verified the presence of expected elements. Dielectric studies demonstrated a high dielectric constant and low loss within a specific temperature range, indicating favourable dielectric behaviour. Impedance spectroscopy identified NTCR characteristics and Cole–Cole plots exhibited a single semicircle at high frequency. The frequency-independent AC conductivity suggested long-range charge carrier mobility, with AC activation energy decreasing as frequency increased.</p>

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Effect of Sm3+ ions doping on structural, dielectric, and electrical behaviour of magnesium ferrite

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Laxmikant Banaj,
  • Jayashri Mahapatro,
  • Arif Khan,
  • Sadhana Agrawal

摘要

Sm3 + -doped magnesium ferrite (Mg1−xFe2O4:xSm) samples were synthesised via the solution combustion method, with doping concentrations of x = 0.0, 0.2, 0.4, and 0.6 mol %. The structural analysis by XRD confirmed a cubic structure with the Fd-3 m space group and the average crystallite size was 36 nm. FT-IR spectra displayed two absorption bands (ν1 and ν2) attributed to tetrahedral and octahedral site vibrations. SEM analysis of the microstructure revealed that all samples exhibited agglomeration, whilst EDX verified the presence of expected elements. Dielectric studies demonstrated a high dielectric constant and low loss within a specific temperature range, indicating favourable dielectric behaviour. Impedance spectroscopy identified NTCR characteristics and Cole–Cole plots exhibited a single semicircle at high frequency. The frequency-independent AC conductivity suggested long-range charge carrier mobility, with AC activation energy decreasing as frequency increased.