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<p>The study reports a magnetocaloric effect (MCE) in the FeMnO<sub>3</sub> bixbyite compound prepared via autocombustion technique using nitrate salts. The X-ray diffraction (XRD) study showed that FeMnO<sub>3</sub> assumes a cubic phase with a space group <i>Ia-3</i>. X-ray photoelectron spectroscopy (XPS) study confirmed the oxidation states of Fe<sup>3+</sup> and Mn<sup>3+</sup>. Temperature-dependent magnetization measurements revealed the presence of antiferromagnetic ordering in the compound at around 40&#xa0;K. The effective magnetic moment, <i>µ</i><sub><i>eff,</i></sub> was calculated as 2.36 µB from the susceptibility curve. Change in maximum magnetic entropy <i>ǀ∆S</i><sub><i>Max</i></sub><i>ǀ</i>, determined from magnetic isotherms, is approximately 4.14 Jkg<sup>−1</sup>&#xa0;K<sup>−1</sup> at 65&#xa0;K under 5&#xa0;T applied field, leading to higher relative cooling power, <i>RCP</i> as 200.29 Jkg<sup>−1</sup>. Specific heat capacity, <i>∆Cp,</i> and temperature-averaged entropy change, <i>TEC</i>, were also analyzed to study magnetic cooling efficiency. This study observed that FeMnO<sub>3</sub> displays potential MCE performance, making it a promising candidate for magnetic refrigeration applications.</p> Graphical abstract <p></p>

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Study of magnetic and magnetocaloric properties of FeMnO3 compound

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月27日

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  • F. Azim,
  • J. Mohapatra,
  • P. Joshi,
  • J. P. Liu,
  • S. R. Mishra

摘要

The study reports a magnetocaloric effect (MCE) in the FeMnO3 bixbyite compound prepared via autocombustion technique using nitrate salts. The X-ray diffraction (XRD) study showed that FeMnO3 assumes a cubic phase with a space group Ia-3. X-ray photoelectron spectroscopy (XPS) study confirmed the oxidation states of Fe3+ and Mn3+. Temperature-dependent magnetization measurements revealed the presence of antiferromagnetic ordering in the compound at around 40 K. The effective magnetic moment, µeff, was calculated as 2.36 µB from the susceptibility curve. Change in maximum magnetic entropy ǀ∆SMaxǀ, determined from magnetic isotherms, is approximately 4.14 Jkg−1 K−1 at 65 K under 5 T applied field, leading to higher relative cooling power, RCP as 200.29 Jkg−1. Specific heat capacity, ∆Cp, and temperature-averaged entropy change, TEC, were also analyzed to study magnetic cooling efficiency. This study observed that FeMnO3 displays potential MCE performance, making it a promising candidate for magnetic refrigeration applications.

Graphical abstract