Surface effects in α-Fe2O3 nanoparticles studied by ILEEMS and TMS

To understand the particular properties of thin α -Fe 2 O 3 films, hematite nanoparticles with sizes between 20 and 140 nm have been examined by integral low-energy electron Mössbauer spectroscopy (ILEEMS) and transmission Mössbauer spectroscopy (TMS) at room temperature and 80 K. By comparing the r...

Full description

Saved in:
Bibliographic Details
Published in:Hyperfine interactions 2009-06, Vol.191 (1-3), p.167-171
Main Authors: Van Cromphaut, C., de Resende, V. G., De Grave, E., Vandenberghe, R. E.
Format: Article
Language:English
Subjects:
Atomic
Condensed Matter Physics
Hadrons
Heavy Ions
Molecular
Nuclear Physics
Optical and Plasma Physics
Physics
Physics and Astronomy
Surfaces and Interfaces
Thin Films
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:To understand the particular properties of thin α -Fe 2 O 3 films, hematite nanoparticles with sizes between 20 and 140 nm have been examined by integral low-energy electron Mössbauer spectroscopy (ILEEMS) and transmission Mössbauer spectroscopy (TMS) at room temperature and 80 K. By comparing the results of both Mössbauer variants, surface effects of the Morin transition are studied. The results clearly indicate that the Morin transition takes place at higher temperature in the interior of the particles as compared to the outer layers. It is found that the lowering of the Morin transition is much stronger at the surface of smaller particles.
ISSN:0304-3843
1572-9540
DOI:10.1007/s10751-009-9939-2