Abstract
Structural, magnetic and magnetocaloric properties of La0.7Sr0.3MnO3 sample have been investigated. Powder sample has been elaborated by the ball milling method. The Rietveld analysis of the powder X-ray diffraction shows that the sample crystallizes in the orthorhombic structure with Pnma space group. Magnetic measurements showed that the sample exhibits a ferromagnetic-to-paramagnetic transition at a Curie temperature close to 370 K. The magnetic entropy change (\( \Delta S_{M}\)) has been deduced by the Maxwell relation method. The maximum value of the magnetic entropy change \(| \Delta S_{M}^{\max} |\) is found to be 1.1 J/kgK for an applied magnetic field of 2T. At this value of magnetic field the relative cooling power (RCP) is 49 J/kg. At high temperature, large change in magnetic entropy has been observed in the sample. Our result on magnetocaloric properties suggests that La0.7Sr0.3MnO3 nanopowder is attractive as a possible refrigerant for high temperature magnetic refrigeration.
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