Patent ID: 9633769
Date: 2017-04-25
CPC Classifications: C21D,C22C,F25B,H01F

Claim:
1. A magnetic refrigeration material of a composition represented by the formula La 1-f RE f (Fe 1-a-b-c-d-e Si a Co b X c Y d Z e ) 13 , wherein RE stands for at least one element selected from the group consisting of rare earth elements including Sc and Y and excluding La, X stands for at least one of Ga and Al, Y stands for at least one element selected from the group consisting of Ge, Sn, B, and C, Z stands for at least one element selected from the group consisting of Ti, V, Cr, Mn, Ni, Cu, Zn, and Zr, a satisfies 0.03≦a≦0.17, b satisfies 0.003≦b≦0.02, c satisfies 0.02≦c≦0.10, d satisfies 0≦d≦0.04, e satisfies 0≦e≦0.04, and f satisfies 0≦f≦0.50, wherein said magnetic refrigeration material has a Curie temperature of not lower than 220 K and not higher than 276 K, and a maximum (−ΔS max ) of magnetic entropy change (−ΔS M ) of said material when subjected to a field change up to 2 Tesla is not less than 5 J/kgK.