As a part of a current research concerning the physical characterisation of Rare Earth intermetallic compounds for magnetic refrigeration devices, the magnetocaloric properties of the Gd7Pd3 phase, which shows a ferromagnetic transition at 318 K, are presented. Heat capacity measurements have been performed in the 5-360 K temperature range and for applied magnetic fields up to 5 T (Tesla). Basing on the heat capacity data the isothermal entropy change DeltaS(M) and the adiabatic temperature rise DeltaT(ad) have been calculated (DeltaS(M) = 2.5 and 6.5 J/K kg and DeltaT(ad) = 3.0 and 8.5 K at 320 K and respectively at 2 and 5 T). From the DeltaS(M) vs. T plot the refrigerant capacity in the 260-360 K temperature range has been calculated to be 100 J/kg for an applied magnetic field of 2 T and 380 J/kg for an applied magnetic field of 5 T.
Magnetocaloric effect in the intermetallic compound Gd7Pd3
CANEPA, FABIO MICHELE;
2002-01-01
Abstract
As a part of a current research concerning the physical characterisation of Rare Earth intermetallic compounds for magnetic refrigeration devices, the magnetocaloric properties of the Gd7Pd3 phase, which shows a ferromagnetic transition at 318 K, are presented. Heat capacity measurements have been performed in the 5-360 K temperature range and for applied magnetic fields up to 5 T (Tesla). Basing on the heat capacity data the isothermal entropy change DeltaS(M) and the adiabatic temperature rise DeltaT(ad) have been calculated (DeltaS(M) = 2.5 and 6.5 J/K kg and DeltaT(ad) = 3.0 and 8.5 K at 320 K and respectively at 2 and 5 T). From the DeltaS(M) vs. T plot the refrigerant capacity in the 260-360 K temperature range has been calculated to be 100 J/kg for an applied magnetic field of 2 T and 380 J/kg for an applied magnetic field of 5 T.
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