Mossbauer study of the interface of iron nanocrystallites

Citation
J. Balogh et al., Mossbauer study of the interface of iron nanocrystallites, PHYS REV B, 61(6), 2000, pp. 4109-4116
Citations number
52
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
10980121 → ACNP
Volume
61
Issue
6
Year of publication
2000
Pages
4109 - 4116
Database
ISI
SICI code
1098-0121(20000201)61:6<4109:MSOTIO>2.0.ZU;2-M
Abstract
The hyperfine parameters of iron atoms are studied in iron nanocrystallites prepared by different methods: ball milling of iron powder, partial crysta llization of Fe-Zr-B-Cu amorphous ribbons, and vacuum evaporation of Fe-B p olycrystalline multilayers. Careful analysis of the spectral contribution o f the possible impurities and chemical mixing at interfaces reveals that no specific grain boundary contribution can be separated in the Mossbauer spe ctra when the grain size is in the 2-10 nm range. The results indicate that excluding chemical effects the hyperfine fields of iron atoms at the bce i nterfaces are very close to those in the bulk, and Mossbauer spectra of the iron nanocrystallites studied can be understood without supposing a separa te grain boundary phase with very distorted structure or highly reduced den sity.