Magnetic material for magnetic refrigeration and method for...

Details Magnetic material for magnetic refrigeration and method for... Magnetic material for magnetic refrigeration and method for...

2006-06-20

2006-06-20

Sheehan, John P. (Department: 1742)

Metal treatment

Stock

Magnetic

C062S003100, C062S003200, C062S003700, C062S006000, C062S914000, C148S306000, C148S307000

Reexamination Certificate

active

07063754

ABSTRACT:
The magnetic material for magnetic refrigeration according to the present invention has an NaZn13-type crystalline structure and comprises iron (Fe) as a principal element (more specifically, Fe is substituted for the position of “Zn”) and hydrogen (H) in an amount of 2 to 18 atomic % based on all constitutional elements. Preferably, the magnetic material for magnetic refrigeration preferably contains 61 to 87 atomic % of Fe, 4 to 18 atomic % of a total amount of Si and Al, 5 to 7 atomic % of La. The magnetic material for magnetic refrigeration exhibits a large entropy change in a room temperature region and no thermal hysteresis in a magnetic phase transition. Therefore, when a magnetic refrigeration cycle is configured using the magnetic material for magnetic refrigeration, a stable operation can be performed.

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ASM Handbook Formerly 9th Edition, Metals Handbook, 1985 pp. 8 and 9.
C. Zimm, et al., Advances in Cryogenic Engineering, vol. 43, pp. 1759-1766, “Description and Performance of a Near-Room Temperature Magnetic Refrigerator”, 1998.

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