Abstract
The temperature dependences of initial magnetic permeability, specific heat capacity and magnetocaloric effect in annealed and quenched samples of Fe 48Rh 51 alloys near the antiferromagnetic-ferromagnetic (AF-F) first-order phase transition have been investigated. The application of a magnetic field of about 2 T to a quenched sample of this alloy at 308.2 K causes a temperature drop of 12.9 K under adiabatic conditions. The magnetocaloric temperature changes were combined with zero-field specific heat data to construct T- S and T- Δ( S m = S e) diagrams for various heat-treated samples of Fe 49Rh 51 alloys and on the basis of these diagrams the refrigerant capacity of alloys was evaluated. The value of the refrigerant capacity of a quenched sample of the alloy at a field of 1.95 T is 135.22 J kg −1 T −1. This value is significantly greater than the refrigerant capacities of well known magnetocaloric materials. The possibility of using the AF-F transition in FeRh alloys for magnetocaloric refrigeration is assessed.
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