Magnetocaloric effect in melt-spun FePd ribbon alloy with second order phase transition

Abstract

Magnetic entropy change and refrigerant capacity for an applied magnetic field variation of 1.5 T have been determined in the temperature range of 293-700 K for the as-quenched polycrystalline Fe73.2Pd26.8melt-spun ribbons alloy. Samples show a major magnetic phase with the fct crystal structure and a Curie temperature of 553 K, at which a second order magnetic phase transition occurs. A maximum magnetic entropy change of 1.04 J kg-1K-1was achieved at 550 K, while the maximum refrigerant capacity of 108 J/kg is attained at the applied field of 1.5 T. The field dependence of the magnetic entropy change for this material follows the phenomenological universal curve and at the temperature of the peak corresponds to a large field independent exponent of n = 0.84. Extrapolated value of field depending RCAreaat 5 T reach above 300 J/kg, which is comparable to that of some of the best-known Fe-doped GdSiGe coolant compounds

This work was financial supported under the Spanish Government and EU FEDER research Projects No MAT2007-65227, MAT2009-13108-C02-01 and 02, MAT 2010-20537, FICYT No FC-09_IB09-131, and the PAI of the Regional Government of Andalucía. FICYT, from Principado de Asturias, is also acknowledged by J.L. Sánchez Llamazares (Contract No. COF07-013)