DocumentCode :
768318
Title :
Rapidly Solidified La(Fe _1 - x Si _x ) _13 Alloys and Their Magnetocaloric Properties
Author :
Hirosawa, Satoshi ; Tomizawa, Hiroyuki ; Bekki, Katsunori
Author_Institution :
Div. Res. & Dev., NEOMAX Co. Ltd.
Volume :
42
Issue :
10
fYear :
2006
Firstpage :
3608
Lastpage :
3610
Abstract :
La(Fe1-xSix)13 alloys with the NaZn13-type structure were prepared from rapidly solidified ribbons via a short annealing treatment. The rapid solidification process was realized by a laboratory scale melt-spinning apparatus and a large strip-casting facility. The rapidly solidified ribbons contained a large amount of the NaZn13-type phase together with an alpha-(Fe-Si) phase and a La-rich phase, which would readily combine to form the NaZn13-type phase upon a short-time annealing. The magnetic part of the entropy change near the Curie temperature at about 190 K was estimated from magnetization versus temperature measurements to be about -20 J/K/kg for a field change between zero and one T. The process developed in this work can be applied to a mass production of La(Fe1-xSix)13 as the starting material for production of hydrogenated La(Fe1-xSi x)13 Hx for near-room-temperature magnetic refrigeration
Keywords :
Curie temperature; iron alloys; lanthanum alloys; magnetic annealing; magnetocaloric effects; rapid solidification; refrigeration; silicon alloys; sodium compounds; Curie temperature; La(FeSi)13; magnetic refrigeration; magnetocaloric effects; melt-spinning apparatus; rapid solidification; short annealing treatment; strip casting; Annealing; Entropy; Laboratories; Magnetic materials; Magnetic properties; Magnetization; Mass production; Refrigeration; Silicon alloys; Temperature measurement; La(Fe; magnetic refrigeration; magnetocaloric effects; rapid solidification; strip casting;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2006.879746
Filename :
1704708
Link To Document :
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