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arXiv · 2405.11269

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

Afaak Lakouader·Youness Hadouch·Daoud Mezzane·Valentin Laguta·Mbarek Amjoud·Voicu Octavian Dolocan·Nikola Novak·Lahoucine Hajji·El Hassan Choukri·Anna Razumnaya·Abdelhadi Alimoussa·Zdravko Kutnjak·Igor A. Lukyanchuk·Mimoun El Marssi
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Abstract

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 -dSM=1.69 J/kg.K at 340 K and dH= 5 T. The associated adiabatic temperature change dTM 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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Afaak Lakouader, Youness Hadouch, Daoud Mezzane, Valentin Laguta, Mbarek Amjoud, Voicu Octavian Dolocan, Nikola Novak, Lahoucine Hajji, El Hassan Choukri, Anna Razumnaya, Abdelhadi Alimoussa, Zdravko Kutnjak, Igor A. Lukyanchuk, Mimoun El Marssi. 2024-05-18. Impact of Polymeric precursor and Auto-combustion on the Structural, Microstructural, Magnetic, and Magnetocaloric Properties of La0.8Sr0.2MnO3. https://arxiv.org/abs/2405.11269

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