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Influence of H and Extra La on Magnetocaloric Effect of La _{0.5 + x} Pr _{0.5} Fe _{11.4} Si _{1.6} Melt-Spun Ribbons

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6 Author(s)
J. J. Liu ; Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology & Engineering, and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology,, Chinese Academy of Sciences,, Ningbo, China ; B. R. Bian ; X. H. Han ; J. W. Nie
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Magnetic properties and magnetocaloric effect were investigated on La0.5+xPr0.5Fe11.4Si1.6Hy (x=0, 0.1, 0.2) melt-spun ribbons. It was found that NaZn13-type phase could be obtained easily owing to that the segregation of α-Fe phase was suppressed obviously by adding appropriate amount of La after a short time annealing for melt-spun ribbons. For the La0.6Pr0.5Fe11.4Si1.6Hy ribbons, the Curie temperature was adjusted dramatically from low temperature of 193 K to room temperature of 321 K due to the interstitial hydrogen adsorption. With La content increasing, Curie temperature was slightly increased; the magnetic hysteresis was reduced, while a large magnetic entropy change remained. The maximum magnetic entropy change (- ΔSM) is 33.8 J/(kg·K) for La0.6Pr0.5Fe11.4Si1.6 while that of La0.6Pr0.5Fe11.4Si1.6Hy is 19.6 J/(kg·K) in a magnetic field change of 5 T. It is shown that rapid quenching to make LaFe13-xSix alloys is more cost effective than arc melting method by reducing annealing time substantially. High magnetic entropy change and low magnetic hysteresis were obtained by adding extra La and the Curie temperature was tuned to near room temperature by interstitial atom H. This work indicated that La0.6Pr0.5Fe11.4Si1.6Hy was a promising magnetic refrigeration material near room temperature.

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IEEE Transactions on Magnetics  (Volume:47 ,  Issue: 10 )