Impact of Polymeric precursor and Auto-combustion on the Structural, Microstructural, Magnetic, and Magnetocaloric Properties of La0.8Sr0.2MnO3 - Université de Picardie Jules Verne Accéder directement au contenu
Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2023

Impact of Polymeric precursor and Auto-combustion on the Structural, Microstructural, Magnetic, and Magnetocaloric Properties of La0.8Sr0.2MnO3

Afaak Lakouader
Valentin Laguta
Nikola Novak
El Hassan Choukri
  • Fonction : Auteur
Abdelhadi Alimoussa
  • Fonction : Auteur
Zdravko Kutnjak

Résumé

In this work, La0.8Sr0.2MnO3 (LSMO) nanopowders are synthesized using two different methods: Pechini (LSMO-PC) and auto-combustion (LSMO-AC). Nanoparticle sizes, structural, magnetic, and magnetocaloric properties were determined and compared. The X-ray diffraction confirms the coexistence of two phases; rhombohedral symmetry with space group R-3c and orthorhombic symmetry with space group Pbnm, with the rhombohedral phase dominating. The scanning electron microscope images show that LSMO-PC has larger nanoparticle sizes (∼ 495 nm) than LSMO-AC (∼195 nm). The samples exhibit ferromagnetic properties with distinct hysteresis loops and Curie temperatures 340 K and 290 K for LSMO-PC and LSMO-AC respectively. The variation of the magnetic entropy was measured indirectly using the Maxwell approach with increasing magnetic field. For LSMO-PC it reaches a maximum -ΔSM=1.69 J/kg.K at 340 K and ΔH= 5 T. The associated adiabatic temperature change ΔTM is 1.04 K. While LSMO-PC demonstrates superior magnetic and magnetocaloric properties, LSMO-AC displays significant magnetocaloric thermal stability. The obtained values make LSMO-PC and LSMO-AC promising candidates for eco-friendly room-temperature magnetocaloric applications.
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Dates et versions

hal-04198426 , version 1 (07-09-2023)

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Citer

Afaak Lakouader, Youness Hadouch, Daoud Mezzane, Valentin Laguta, M'Barek Amjoud, et al.. Impact of Polymeric precursor and Auto-combustion on the Structural, Microstructural, Magnetic, and Magnetocaloric Properties of La0.8Sr0.2MnO3. Journal of Magnetism and Magnetic Materials, 2023, pp.171225. ⟨10.1016/j.jmmm.2023.171225⟩. ⟨hal-04198426⟩
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