Magnetocaloric properties of a first-order magnetic transition system ErCo2

摘要

The magnetocaloric effect was examined for ErCo2,which shows a first-order magnetic transition from a ferrimagneticto paramagnetic state at 32K. A large magnetic entropy change wascaused by a magnetic field. The corresponding entropy change ?Sand the adiabatic temperature change ?Tad are 12J/K mol and 13K ,respectively in a change of magnetic field 0-8T at 32 K. Thesubstitution of 20% Y for Er leads to a reduction of themagnetocaloric properties by 20-30%. The origin of the largemagnet-ocaloric effect is also discussed. 2000 Elsevier ScienceLtd. All rights reserved.