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◆ Abstract

2009 IEEE Magnetic Society Summer School. ◆ Result and discussion.

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◆ Abstract

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  1. 2009 IEEE Magnetic Society Summer School ◆Result and discussion Investigation on magnetocaloric effect of La0.8Ce0.2Fe11.4-xNixSi1.6 compounds Zhiping Lin, Shandong Li*, Meimei Liu, JianglinFang, and Jenq-Gong DuhDepartment of Physics, Fujian Normal University, Fuzhou 350007, P.R.China Fig. 1 X-ray diffraction patterns of the annealed La0.8Ce0.2Fe11.4-xNixSi1.6 (x=0, 0.1, 0.2, 0.3, 0.4, 0.5) ◆Abstract The effect of Ni doping into Magnetocaloric effect (MCE) material La0.8Ce0.2(FeSi)13 has been studied. It is interesting to find that Curie temperature (Tc) of La0.8Ce0.2(FeSi)13 compounds can be adjusted by the substitution of Ni for Fe. With the increase of Ni content, a reduction of thermal lag and magnetic hysterisis was observed, while working temperature span improved obviously. La0.8Ce0.2Fe10.9Ni0.5Si1.6 remains a larger MCE value of 6J.Kg-1.K-1 and an enhancement over 20 K at Tc under 3T. The compounds exhibit a magnetic transition from first-order to second-order. Fig. 3 M-H curve for (a) La0.8Ce0.2Fe11.4Si1.6 (b) La0.8Ce0.2Fe11Ni0.5Si1.6 And Arrott plots for (c) La0.8Ce0.2Fe11.4Si1.6 and (d) La0.8Ce0.2Fe11Ni0.5Si1.6 Fig. 2The thermomagnetic M-T curves for La0.8Ce0.2Fe11.4-xNixSi1.6(x=0, 0.1, 0.2, 0.3, 0.4,0.5)compounds under 0.1 T Fig. 4 The magnetic entropy change plot for La0.8Ce0.2Fe11.4-xNixSi1.6 (a)x=0.0, (b) x=0.5 under 1, 2, 3T applied field ◆Conclusions The compounds of La0.8Ce0.2Fe11.4-xNixSi1.6(x=0, 0.1, 0.2, 0.3, 0.4, 0.5) hold a large maximum △S and amplificatory temperature span, which suggests a great refrigeration capacity. Ni addition induce an enhancement of Tc in NaZn13-type compounds as reported in Co doping, and dramatical reduction in thermal lag and hysteresis loss. In conclusion, the substitution of Ni for La0.8Ce0.2Fe11.4-xNixSi1.6 (x=0, 0.1, 0.2, 0.3, 0.4, 0.5) exihibits a fantastic application preview in magnetic refregaration, and possibly adjust the working temperature to room temperature. ◆Acknowledgements Supported by NCET-08-0631, NSFC (10504010 and 50501008), and 2009H0019. *Corresponding author: Prof. Shandong Li, Tel:86+0591-28198956 Email: dylsd007@yahoo.com.cn

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