MAGNETIC MATERIAL FOR MAGNETIC REFRIGERATION

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PROBLEM TO BE SOLVED : To improve magnetic entropy variation (ΔS) attendant on magnetic phase transition, in a magnetic material for magnetic refrigeration exhibiting secondary magnetic phase transition in the vicinity of room temperature, by using an inexpensive material system in which contents of rare earth elements are reduced. SOLUTION : The magnetic material for magnetic refrigeration has a composition represented by (R11-yR2y)xFe100-x (wherein, R1 is at least one element selected between Sm and Er; R2 is at least one element selected from among Ce, Pr, Nd, Tb and Dy; and (x) and (y) satisfy 4≤x≤20 atomic% and 0.05≤y≤0.95, respectively) and has a structure in which main phase is composed of one kind selected from a Th2Zn17 type crystal phase, a Th2Ni17 type crystal phase and a TbCu7 type crystal phase, or further, at least one element X selected from Ti, Zr and Hf is substituted for a part of the elements R and the main phase of the R-Fe magnetic material is composed of a Th2Ni17 type crystal phase or a TbCu7 type crystal phase. COPYRIGHT : (C)2008, JPO&INPIT