Acta Metallurgica Sinica (English Letters) >
Effect of Particle Size on the Hysteretic Behavior and Magnetocaloric Effect of La0.5Pr0.5Fe11.4Si1.6 Compound
Received date: 2013-06-18
Revised date: 2013-09-13
Online published: 2014-03-11
Bulk La0.5Pr0.5Fe11.4Si1.6 compound exhibits a large magnetic-entropy change ΔSm of 28.1 J/(kg K) for a magnetic-field change from 0 to 1.5 T at the Curie temperature, TC of 186 K, accompanied by a large magnetic hysteresis of 56 J/kg and a noticeable thermal hysteresis of about 1 K. If the bulk sample is ground into middle-size particles (30–60 μm), then the thermal hysteresis is almost eliminated and the magnetic hysteresis loss is decreased by 29%, while the large ΔSm maintains. Especially, fine powder with an average size of 2 μm shows the same TC as the bulk and does not lose stability. Meanwhile, a comparatively large ΔSm of 13.9 J/(kg K) and a hysteresis reduction of 70% are attained. The hysteresis reduction can be ascribed to the decrease of internal strains and to the improvement of heat transfer due to the increase of the ratio of the surface area to the volume.
Key words： Magnetocaloric effect; Magnetic hysteresis; Particle size
Jiaohong Huang , Naikun Sun , Cuilan Liu , Yumei Ge , Tao Zhang , Feng Liu , Pingzhan Si . Effect of Particle Size on the Hysteretic Behavior and Magnetocaloric Effect of La0.5Pr0.5Fe11.4Si1.6 Compound[J]. Acta Metallurgica Sinica (English Letters), 2014 , 27(1) : 27 -30 . DOI: 10.1007/s40195-014-0031-9
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