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<p>In this work, La<sub>1 − x</sub>MgₓFeO₃ (0.0 ≤ x ≤ 0.20) perovskite nanoparticles were successfully synthesized using a green synthesis route assisted by Moringa oleifera leaf extract. The influence of Mg²⁺ substitution on the structural, dielectric, and magnetic properties of LaFeO₃ was systematically investigated. X-ray diffraction and Rietveld refinement revealed a clear phase transition from cubic (Pm-3&#xa0;m) to orthorhombic (Pnma) symmetry at x ≥ 0.17. Low Mg doping (x = 0.05, 0.10) induced a slight lattice expansion due to oxygen vacancy formation and Fe³⁺ → Fe²⁺ reduction, while higher doping levels led to lattice contraction from ionic size mismatch and structural distortion. Dielectric measurements demonstrated a significant enhancement in dielectric constant and suppression of dielectric loss up to x = 0.15, attributed to improved interfacial polarization and defect-induced conduction. Magnetic analysis via Vibrating Sample Magnetometer (VSM) and electron spin resonance (ESR) confirmed a transition from weak ferromagnetic to strong ferromagnetic behavior with increased Mg content, peaking at x = 0.17 due to enhanced Fe³⁺/Fe⁴⁺ exchange interactions and surface spin effects. These findings highlight the potential of Mg-doped LaFeO₃ nanoparticles for multifunctional applications in energy storage, sensing, and spintronic devices, while emphasizing the environmental and economic advantages of green synthesis approaches.</p>

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Structure and physical property correlation in magnesium doped LaFeO3 nano perovskites synthesized by the green method

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月11日

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  • Abdalrahman M. Rayan,
  • Mehawed M. Ahmed,
  • H. A. A. Saadallah,
  • A. A. Azab,
  • Kh. Roumaih,
  • A. M. Abdel Hakeem

摘要

In this work, La1 − xMgₓFeO₃ (0.0 ≤ x ≤ 0.20) perovskite nanoparticles were successfully synthesized using a green synthesis route assisted by Moringa oleifera leaf extract. The influence of Mg²⁺ substitution on the structural, dielectric, and magnetic properties of LaFeO₃ was systematically investigated. X-ray diffraction and Rietveld refinement revealed a clear phase transition from cubic (Pm-3 m) to orthorhombic (Pnma) symmetry at x ≥ 0.17. Low Mg doping (x = 0.05, 0.10) induced a slight lattice expansion due to oxygen vacancy formation and Fe³⁺ → Fe²⁺ reduction, while higher doping levels led to lattice contraction from ionic size mismatch and structural distortion. Dielectric measurements demonstrated a significant enhancement in dielectric constant and suppression of dielectric loss up to x = 0.15, attributed to improved interfacial polarization and defect-induced conduction. Magnetic analysis via Vibrating Sample Magnetometer (VSM) and electron spin resonance (ESR) confirmed a transition from weak ferromagnetic to strong ferromagnetic behavior with increased Mg content, peaking at x = 0.17 due to enhanced Fe³⁺/Fe⁴⁺ exchange interactions and surface spin effects. These findings highlight the potential of Mg-doped LaFeO₃ nanoparticles for multifunctional applications in energy storage, sensing, and spintronic devices, while emphasizing the environmental and economic advantages of green synthesis approaches.