DocumentCode :
1012352
Title :
Analytical microscope studies of sintered Nd-Fe-B magnets
Author :
Fidler, J.
Author_Institution :
Technical University, Karlsplatz, Vienna, Austria
Volume :
21
Issue :
5
fYear :
1985
fDate :
9/1/1985 12:00:00 AM
Firstpage :
1955
Lastpage :
1957
Abstract :
Various sintered Nd15Fe77B8permanent magnets supplied by different producers have been examined by analytical electron microscopy. An identical microstructure was found in all of the different magnets. Three phases were detected by means of high resolution electron microscopy, electron diffraction and x-ray microanalysis. Besides the hard magnetic boride phase Nd2Fe14B, a soft magnetic boride phase close to Nd2Fe7B6, and a Nd-rich sintering aid phase (d.h.c.p. structure) were identified. The Nd-rich phase preferentially occurs along grain boundaries as a thin layer with about 10 nm tickness. The soft magnetic phases determine the magnetization reversal and limit the coercivity of sintered Nd-Fe-B magnets.
Keywords :
Permanent magnets; Electron microscopy; Iron; Magnetic analysis; Magnetic force microscopy; Microstructure; Neodymium; Permanent magnets; Phase detection; Soft magnetic materials; X-ray detection;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1985.1063992
Filename :
1063992
Link To Document :
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