Alloys of the FeRh system as a new class of working material for magnetic refrigerators

✍ Scribed by M.P. Annaorazov; K.A. Asatryan; G. Myalikgulyev; S.A. Nikitin; A.M. Tishin; A.L. Tyurin

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 520 KB
• Volume: 32
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(92)90352-b

✦ Synopsis

The temperature dependences of initial magnetic permeability, specific heat capacity and magnetocaloric effect in annealed and quenched samples of Fe49Rhs1 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 temeprature changes were combined with zero-field specific heat data to construct T-S and T-A(Sm + Se) diagrams for various heat-treated samples of Fe49Rhsl 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-I. 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.