| Abstrakt: |
Polycrystalline PrFeMn ( x = 0, 1, and 2) alloys were studied by X-ray diffraction (XRD), heat capacity, ac susceptibility, and isothermal magnetization measurements. All the alloys adopt the rhombohedral ThZn-type structure. The Curie temperature increases from 283 K at x = 0 to 294 K at x = 1, and then decreases to 285 K at x = 2. The magnetic phase transition at the Curie temperature is a typical second-order paramagnetic-ferromagnetic transition. For an applied field change from 0 to 5 T, the maximum −Δ S for PrFeMn alloys with x = 0, 1, and 2 are 5.66, 5.07, and 4.31 J·kg·K, respectively. The refrigerant capacity ( RC) values range from 458 to 364 J·kg , which is about 70 %-89 % that of Gd. The large, near room temperature Δ S and RC values, chemical stability, and a high performance-to-cost ratio make PrFeMn alloys be selectable materials for room temperature magnetic refrigeration applications. [ABSTRACT FROM AUTHOR] |
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