Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Magnetocaloric Properties of AlFe2B2 Including Paramagnetic Impurities of Al13Fe4

  • Lee, J.W. (Department of Photonics and Sensors, Hannam University) ;
  • Song, M.S. (School of Materials Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Cho, K.K. (School of Materials Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Cho, B.K. (School of Materials Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Nam, Chunghee (Department of Photonics and Sensors, Hannam University)
  • Received : 2018.04.20
  • Accepted : 2018.05.30
  • Published : 2018.11.30
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Abstract

$AlFe_2B_2$ produced by using a conventional arc melter has a ferromagnetic material with a Curie temperature ($T_C$) of around 300 K, but the arc-melt generates paramagnetic $Al_{13}Fe_4$ impurities during the synthesis of $AlFe_2B_2$. Impurities are brought to cause a decrease in magnetocaloric effects (MCEs). To investigate the effects of $Al_{13}Fe_4$ impurities on MCEs, we prepared and compared ascast and acid-treated samples, where the acid treatment was performed to remove the $Al_{13}Fe_4$ impurities. For the structural analysis, powder X-ray diffraction was carried out, and the measured data were subjected to a Rietveld refinement. The presence of $Al_{13}Fe_4$ impurities in the as-cast sample was observed in the phase analysis measurements. Magnetic properties were investigated by using Superconducting Quantum Interference Device (SQUID) measurements for the as-cast and the acid-treated $AlFe_2B_2$ samples. From isothermal magnetization measurements, Arrott plots were obtained showing that the transition of $AlFe_2B_2$ has a second-order magnetic phase transition (SOMT). The $T_C$ and the saturation magnetization increased for the acid-treated sample due to removal of the paramagnetic impurities. As a consequence, the magnetic entropy change ($-{\Delta}S$) increased in the pure $AlFe_2B_2$ samples, but the full width at half maximum in the plot of $-{\Delta}S$ vs. T decreased due to the absence of impurities.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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