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<p>Nonstoichiometric FeMnO<sub>3-δ</sub> perovskite nanoparticles was synthesized by sol–gel method. Rietveld refinement of X-ray diffraction (XRD) data revealed that FeMnO<sub>3-δ</sub> sample crystallized in cubic bixbyite structure with space group Ia3. The morphological characterizations of this sample were performed by using transmission electron microscopy (TEM), selected area electron diffraction (SAED) pattern, high-resolution TEM (HR-TEM) and Energy dispersive X-ray spectroscopy (EDS) mapping. The N<sub>2</sub> adsorption–desorption isotherm curve of this sample confirmed the existence of micro-mesoporous structure. The presence of Fe<sup>2+</sup>/Fe<sup>3+</sup>, Mn<sup>3+</sup>/Mn<sup>4+</sup> and oxygen vacancies in this sample were confirmed by X-ray photoelectron spectroscopy (XPS) analysis. UV–Vis absorption spectrum revealed that nonstoichiometric FeMnO<sub>3-δ</sub> perovskite exhibited semiconductor with direct band gap energy (E<sub>g</sub>) of 3.7&#xa0;eV. The room temperature magnetization hysteresis (M–H) loop revealed that FeMnO<sub>3-δ</sub> perovskite exhibited antiferromagnetic behavior with small fraction of weak ferromagnetic. The electrochemical results revealed that the nonstoichiometric FeMnO<sub>3-δ</sub> exhibited pseudocapacitive behavior. The obtained results confirmed that FeMnO<sub>3-δ</sub> perovskite is considered as a promising supercapacitor electrode.</p>

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Optical, Magnetic, and Electrochemical Characterization of Nonstoichiometric FeMnO3-δ Perovskite Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Abdullah Almohammedi,
  • E. K. Abdel-Khalek,
  • Yasser A. M. Ismail

摘要

Nonstoichiometric FeMnO3-δ perovskite nanoparticles was synthesized by sol–gel method. Rietveld refinement of X-ray diffraction (XRD) data revealed that FeMnO3-δ sample crystallized in cubic bixbyite structure with space group Ia3. The morphological characterizations of this sample were performed by using transmission electron microscopy (TEM), selected area electron diffraction (SAED) pattern, high-resolution TEM (HR-TEM) and Energy dispersive X-ray spectroscopy (EDS) mapping. The N2 adsorption–desorption isotherm curve of this sample confirmed the existence of micro-mesoporous structure. The presence of Fe2+/Fe3+, Mn3+/Mn4+ and oxygen vacancies in this sample were confirmed by X-ray photoelectron spectroscopy (XPS) analysis. UV–Vis absorption spectrum revealed that nonstoichiometric FeMnO3-δ perovskite exhibited semiconductor with direct band gap energy (Eg) of 3.7 eV. The room temperature magnetization hysteresis (M–H) loop revealed that FeMnO3-δ perovskite exhibited antiferromagnetic behavior with small fraction of weak ferromagnetic. The electrochemical results revealed that the nonstoichiometric FeMnO3-δ exhibited pseudocapacitive behavior. The obtained results confirmed that FeMnO3-δ perovskite is considered as a promising supercapacitor electrode.