The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 2006
Filed:
Apr. 01, 2003
Kazuaki Fukamichi, Sendai, JP;
Asaya Fujita, Sendai, JP;
Yoshiaki Iijima, Sendai, JP;
Akiko Saito, Kawasaki, JP;
Tadahiko Kobayashi, Yokohama, JP;
Masashi Sahashi, Yokohama, JP;
Kazuaki Fukamichi, Sendai, JP;
Asaya Fujita, Sendai, JP;
Yoshiaki Iijima, Sendai, JP;
Akiko Saito, Kawasaki, JP;
Tadahiko Kobayashi, Yokohama, JP;
Masashi Sahashi, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
The magnetic material for magnetic refrigeration according to the present invention has an NaZn-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.