TITLE

Nucleation and growth processes of α-Fe nanocrystals in amorphous NdFeBCoDy: In situ x-ray diffraction studies

AUTHOR(S)
Li, W.; Li, X. H.; Sun, H. Y.; Zhang, J. W.; Zhang, X. Y.
PUB. DATE
February 2005
SOURCE
Applied Physics Letters;2/28/2005, Vol. 86 Issue 9, p092501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
For a detailed understanding of formation processes of nanocrystals in an amorphous matrix, the study of crystal nucleation and growth processes is of basic interest. In the present study, these processes of α-Fe nanocrystals in amorphous NdFeCoDyB have been studied separately by employing in situ high-temperature x-ray diffraction measurements. A small growth activation energy Eg=(1.8±0.2)eV was determined from the isothermal time dependence of the grain size of α-Fe crystals. By these data together with the nucleation activation energy En=(3.0±0.1)eV, a coarse grain size for the α-Fe phase in the α-Fe/Nd2Fe14B nanocomposites developed from amorphous NdFeBCoDy can be understood.
ACCESSION #
16581455

 

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