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<p>Aluminium (Al)-substituted BiFeO3 (Bi<sub>1-x</sub>Al<sub>x</sub>FeO<sub>3</sub>) nanoparticles were synthesised via a solution-combustion route using L-alanine as fuel, and their structural, optical, magnetic, and electrochemical properties were systematically investigated. X-ray diffraction confirmed a rhombohedral perovskite structure, while TEM/EDX analyses verified uniform Al incorporation within nanoparticles averaging 38–55&#xa0;nm in size. Diffuse reflectance spectroscopy revealed a reduction in the band gap from 2.16&#xa0;eV (undoped) to 2.12&#xa0;eV with 10% Al doping, indicating improved electronic conductivity. Electrochemical measurements in 3&#xa0;M KOH demonstrated a specific capacitance of 224&#xa0;F g<sup>-1</sup> at 10 mV s<sup>-1</sup>, representing a ~ 26% enhancement over undoped BiFeO3, along with excellent rate capability and &gt; 95% capacitance retention after 5000 cycles. Impedance spectra exhibit a depressed high-frequency arc and a low-frequency diffusion tail; fitting with Rs-(Rct ∥ CPE)-Zw yields reduced Rct for the Al-substituted samples relative to undoped BiFeO3, evidencing faster interfacial charge transfer. Vibrating sample magnetometry showed a doping-induced increase in the ferromagnetic component at room temperature, attributed to cation substitution and strain effects. The combined improvements in charge storage, magnetic response, and optical properties highlight Al-doped BiFeO<sub>3</sub> as a promising multifunctional material for energy storage and spintronic applications.</p>

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Synthesis and magnetic property studies of aluminum-doped BiFeO3 perovskite-type nanoparticles produced by combustion method for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Jothi Ramalingam Rajabathar,
  • Chandra Sekhar Dash,
  • Shree Kesavan Kannan,
  • S. Sathish,
  • Hamad Allohedan,
  • S. Yuvaraj,
  • M. Sundararajan,
  • Saleh M. H. Aljamhoor,
  • Sivasankaran Ayyaru,
  • Young-Ho Ahn

摘要

Aluminium (Al)-substituted BiFeO3 (Bi1-xAlxFeO3) nanoparticles were synthesised via a solution-combustion route using L-alanine as fuel, and their structural, optical, magnetic, and electrochemical properties were systematically investigated. X-ray diffraction confirmed a rhombohedral perovskite structure, while TEM/EDX analyses verified uniform Al incorporation within nanoparticles averaging 38–55 nm in size. Diffuse reflectance spectroscopy revealed a reduction in the band gap from 2.16 eV (undoped) to 2.12 eV with 10% Al doping, indicating improved electronic conductivity. Electrochemical measurements in 3 M KOH demonstrated a specific capacitance of 224 F g-1 at 10 mV s-1, representing a ~ 26% enhancement over undoped BiFeO3, along with excellent rate capability and > 95% capacitance retention after 5000 cycles. Impedance spectra exhibit a depressed high-frequency arc and a low-frequency diffusion tail; fitting with Rs-(Rct ∥ CPE)-Zw yields reduced Rct for the Al-substituted samples relative to undoped BiFeO3, evidencing faster interfacial charge transfer. Vibrating sample magnetometry showed a doping-induced increase in the ferromagnetic component at room temperature, attributed to cation substitution and strain effects. The combined improvements in charge storage, magnetic response, and optical properties highlight Al-doped BiFeO3 as a promising multifunctional material for energy storage and spintronic applications.