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Document IIF

Modulation des propriétés magnétiques et magnétocaloriques des oxydes de manganèse de terres rares La0.65Ca0.35MnO3 dopés à l’aluminium au site B.

B-site doped Al modulation of magnetic and magnetocaloric properties of rare earth-based manganese oxides La0.65Ca0.35MnO3.

Numéro : 0028

Auteurs : LI Q., MA H., GAO L., JIN X., ZHAO J., XU J., HUANG J.

Résumé

In this work, the modulation of the magnetic and magnetocaloric properties of the classical La0.65Ca0.35MnO3 system by B-site doping with the non-magnetic element Al has been investigated. Structural studies of La0.65Ca0.35Mn1-xAlxO3 (x=0.0 and 0.1) show that the substitution of the small ionic radius Al3+ by Mn3+ leads to a decrease in cell volume. Based on the Density functional theory (DFT), the Total Density of States (TDOS) and the Partial Wave Density of States (PDOS) of the system are calculated using the Vienna ab initio Simulation Package (VASP). It is found that the doped system weakens the O-2p orbitals and the Mn-3d crossover, which in turn directly affects the double-exchange interactions of the system. The Curie temperature (TC) is effectively controlled from 261 K to 98 K. The magnetocaloric effect studies show that the doped samples exhibit a wider full width at half-maximum temperature region (ΔTFWHM), increased from 30.89 K to 50.65 K (at 5 T magnetic field). It showed superior relative cooling capacity (RCP = 239.44 J·kg-1 (x=0.0, μ0H=5T); 281.45 J·kg-1 (x=0.1, μ0H=5T)) and refrigerant capacity (RC= 186.82 J·kg-1 (x=0.0, μ0H=5T); 229.76 J·kg-1 (x=0.1, μ0H=5T)). The high overlap between TEC (4K) and |-ΔSMmax| at the same magnetic field of the sample after doping suggests good utility. Based on the Landau theory and the magnetocaloric effect, it was found that this series of materials belongs to the type of first-order phase transition and the continuity of the phase transition is enhanced after doping. The B-site doping of Al has been demonstrated to optimize the magnetocaloric properties of the La0.65Ca0.35MnO3 system. The possibility of cryogenic magnetic refrigeration applications for this material is provided.

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Pages : 12

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Détails

  • Titre original : B-site doped Al modulation of magnetic and magnetocaloric properties of rare earth-based manganese oxides La0.65Ca0.35MnO3.
  • Identifiant de la fiche : 30032636
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 10th IIR Conference on Caloric Cooling and Applications of Caloric Materials
  • Date d'édition : 24/08/2024
  • DOI : http://dx.doi.org/10.18462/iir.thermag.2024.0028

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