Investigation on magnetocaloric effect of La0.8Ce0.2Fe11.4-xNixSi1.6 compounds

Zhiping Lin, Shandong Li*, Meimei Liu, Jianglin Fang, and Jenq-Gong Duh

Department of Physics, Fujian Normal University, Fuzhou 350007, P.R.China

◆AbstractThe 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.

2009 IEEE Magnetic Society Summer School

◆Result and discussion

gTxTmTlT xT /g mT T/g lT 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

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)

Fig. 2 The 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. 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

◆ConclusionsThe 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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