| 简介 |
Provided is a magnetic refrigeration material which has a Curie temperature of not lower than 250 K, and provides refrigeration performance well over that of conventional materials when subjected to a field change up to 2 Tesla, which is assumed to be achievable with a permanent magnet. The magnetic refrigeration material is of a composition represented by the formula La1 fREf (Fe1 a b c d eSiaCobXcYdZe)13 (RE : at least one of rare earth elements including Sc and Y and excluding La; X : Ga and/or Al; Y : at least one of Ge, Sn, B, and C; Z : at least one of Ti, V, Cr, Mn, Ni, Cu, Zn, and Zr; 0.03≦a≦0.17, 0.003≦b≦0.06, 0.02≦c≦0.10, 0≦d≦0.04, 0≦e≦0.04, 0≦f≦0.50), and has an average crystal grain size of not smaller than 0.01 μm and not larger than 3 μm, a Curie temperature of not lower than 250 K, and the maximum (−ΔSmax) of magnetic entropy change (−ΔSM) when subjected to a field change up to 2 Tesla is not less than 5 J/kgK. |
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