aSfax University, Faculty of Sciences of Sfax, B. P. 1171–3000 Sfax, TUNISIA
bInstitute Neel, CNRS and Joseph Fourrier University, BP 166, F -38042 Grenoble Cedex 9, FRANCE
cSfax University, National Engineering School of Sfax, B. P. W – 3038Sfax, TUNISIA
dLEPMI UMR 5279, CNRS - Grenoble INP - Université de Savoie - Université Joseph Fourier, 1130 rue de la Piscine, BP 75, 38402 Saint-Martin d'Hères Cedex, FRANCE
Received 4 February 2014, Revised 4 April 2014, Accepted 6 April 2014, Available online 16 April 2014
The La0.6Pr0.1Sr0.3Mn1−xFexO3 (0 ≤ x ≤ 0.3) polycrystalline samples were prepared by solid state reaction method.
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Crystalline and magnetic structures were investigated using DRX and magnetization measurements.
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Magnetocaloric (MC) effect were estimated versus magnetic field and temperatures.
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Compounds with x=0, 0.1 exhibit great potential for magnetic refrigeration at room temperature.
Abstract
The La0.6Pr0.1Sr0.3Mn1−xFexO3 (x =0, 0.1, 0.2 and 0.3) samples have been elaborated by the solid-state reaction method. X-ray powder diffraction shows that all the samples crystallize in rhombohedric phase with space group. The variation of magnetization as a function of temperature and applied magnetic field were carried out. The samples for x =0 and 0.1 exhibit a FM-PM transition at the Curie temperature TC, however, for x =0.2 and 0.3 exhibit an AFM-PM one at the Neel temperature TN, when the temperature increases. Magneto-caloric effect has been calculated in terms of isothermal magnetic entropy change. A large magneto-caloric effect has been observed, the maximum entropy change, , reaches the highest value of 3.28 J/kgK under a magnetic field change of 5 T with an RCP value of 220 J/kg for La0.6Pr0.1Sr0.3MnO3 composition, which will be an interesting compound for application materials working as magnetic refrigerants near room temperature.
