Metal treatment – Stock – Magnetic
Patent
1992-02-06
1993-05-25
Sheehan, John P.
Metal treatment
Stock
Magnetic
75255, 75228, 62 31, H01F 1053
Patent
active
052136302
ABSTRACT:
A magnetic refrigeration composition for magnetic refrigeration including at least three kinds of magnetic substances selected from the group consisting of magnetic substances having the formula
R'Al.sub.2, R'.sub.3 Al.sub.2, and R'Al.sub.2+.delta.
wherein R' is at least one element selected from the group consisting of Gd, Tb, Dy, Ho and Er, provided that the total number of atoms satisfies the above formula and 0<.delta.<0.2, the composition being a mixture of the magnetic substances, wherein each kind of said at least three kinds of magnetic substances has a Curie temperature which is different from that of the other kinds and which preferably range up to about 77.degree. K.
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Sheehan John P.
Tokyo Institute of Technology
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