Effect of Particle Size on the Hysteretic Behavior and Magnetocaloric Effect of La0.5Pr0.5Fe11.4Si1.6 Compound

doi:10.1007/s40195-014-0031-9

Abstract

Abstract:

Bulk La_0.5Pr_0.5Fe_11.4Si_1.6 compound exhibits a large magnetic-entropy change ΔS_m of 28.1 J/(kg K) for a magnetic-field change from 0 to 1.5 T at the Curie temperature, T_C 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 ΔS_m maintains. Especially, fine powder with an average size of 2 μm shows the same T_C as the bulk and does not lose stability. Meanwhile, a comparatively large ΔS_m 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 La_0.5Pr_0.5Fe_11.4Si_1.6 Compound[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(1): 27-30.

Figures/Tables 4

Fig. 1 Morphology and size distribution of small-size particles (smaller than 30 μm and ~10 μm on average) a and fine powders (~2 μm on average) b

Fig. 2 Temperature dependence of the magnetization at 0.005 T for bulk La0.5Pr0.5Fe11.4Si1.6 compound and particles with different sizes

Fig. 3 Field dependence of the magnetization for the La0.5Pr0.5Fe11.4Si1.6 compound and particles with different sizes at different temperatures near TC: a 181 K; b 183 K; c 185 K; d 187 K; e 189 K

Fig. 4 Magnetic-entropy changes of bulk La0.5Pr0.5Fe11.4Si1.6 compound and particles with different sizes at the external-field change from 0 to 1.5 T

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