|標題:||Magnetocaloric Properties of Melt-Spun Fe-Ni-Mn-Ga Ribbons|
|作者:||Shih, C. W.|
Zhao, X. G.
Chang, H. W.
Tseng, Y. C.
Chang, W. C.
Department of Materials Science and Engineering
|關鍵字:||Heusler alloy;magnetocaloric properties;melt-spun ribbon|
|摘要:||The effects of Ni substitution for Fe on phase constitutions, Curie temperature T-C, and magnetocaloric properties of melt-spun Fe50-xNixMn25Ga25 (x =0, 1, 3, 5 and 7) ribbons have been investigated. X-ray diffraction results show that the main phase in the Fe50-xNixMn25Ga25 (x = 0-7) alloy changed with the increase of Ni content from FCC structure for x = 0 into B2 structure for x = 1-7. Besides, the magnetic phase exhibits phase transition of ferromagnetic into paramagnetic state with increasing temperature for the samples with B2-type structure. The Curie temperature T-C of these ribbons varies in the temperature range of 232-257 K. The peak values of the maximal magnetic entropy change, -Delta S-M(max), are about 1.4-1.6 Jkg/K for Ni-substituted ribbons at a maximum applied field of 30 kOe. On the other hand, the relatively broader temperature range at the half maximum of Delta S-M peak (similar to 90 K), low-cost and nontoxic elements make Fe-Ni-Mn-Ga-based ribbons the promising candidates for magnetic refrigeration applications close to room temperature.|
|期刊:||IEEE TRANSACTIONS ON MAGNETICS|
|Appears in Collections:||Articles|
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