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<p>Using the sol-gel process, nano-structured Fe–substituted LaCoO<sub>3</sub> was created, and its structural, vibrational, and magnetic characteristics were assessed. The trigonal structure of all the samples, with Fe-induced variations in unit cell volume, was confirmed by XRD. Characteristic vibrational modes were moved to lower wavenumbers in the Raman spectra, and at increasing Fe content, Jahn-Teller distortion was minimized. Fe substitution–related morphological alterations were detected by FESEM, most likely impacting surface area, grain boundaries, and spin interactions. At all temperatures, pure LaCoO<sub>3</sub> was paramagnetic, but the <i>x</i> = 0.5 sample showed ferromagnetism because of strong Fe–Co interactions. Due to the Fe–O–Co superexchange interaction, substitution-enhanced magnetic moments (M–H curves) are present in all samples, exhibiting paramagnetism at room temperature and hysteresis at low temperatures.</p>

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Structural and magnetic properties of Fe-substituted LaCoO3

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • K. Yadagiri,
  • M. Tarun,
  • Anupam Upadhyay,
  • N. Narasaiah

摘要

Using the sol-gel process, nano-structured Fe–substituted LaCoO3 was created, and its structural, vibrational, and magnetic characteristics were assessed. The trigonal structure of all the samples, with Fe-induced variations in unit cell volume, was confirmed by XRD. Characteristic vibrational modes were moved to lower wavenumbers in the Raman spectra, and at increasing Fe content, Jahn-Teller distortion was minimized. Fe substitution–related morphological alterations were detected by FESEM, most likely impacting surface area, grain boundaries, and spin interactions. At all temperatures, pure LaCoO3 was paramagnetic, but the x = 0.5 sample showed ferromagnetism because of strong Fe–Co interactions. Due to the Fe–O–Co superexchange interaction, substitution-enhanced magnetic moments (M–H curves) are present in all samples, exhibiting paramagnetism at room temperature and hysteresis at low temperatures.