Impact of Polymeric precursor and Auto-combustion on the Structural, Microstructural, Magnetic, and Magnetocaloric Properties of La0.8Sr0.2MnO3
arxiv(2024)
摘要
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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