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

Résumé

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 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.

Citer ce document

Accès au document

Texte intégral en lecture en ligne, réservé aux abonnés SPHAERO et aux membres de l'institution. Se connecter

Auteur(s)

Statistiques

Consultations : 1

Téléchargements : 0