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Study of the Lattice Dynamics of Iron Nanocrystals by Mossbauer Spectroscopy*

Published online by Cambridge University Press:  21 February 2011

J. Childress ,
A. Levy  and
C. L. Chien
J. Childress
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218
A. Levy
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218
C. L. Chien
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218
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Abstract

The vibrational properties of iron particles with nanometer sizes in Fe-SiO2 and Fe-A12O3 granular materials are studied by Mössbauer spectroscopy. The spectra include contributions from metallic Fe atoms at the core of the particles and apparently from surface and oxidized Fe atoms, which are analyzed separately. The temperature dependences of the recoilless fractions are analyzed using the Debye model. The Mossbauer Debye temperature ΘM for metallic Fe is found to decrease dramatically with smaller grain sizes, indicative of a “softening” of the phonon spectrum.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 132: Symposium G – Multicomponent Ultrafine Microstructures , 1988 , 161
Copyright
Copyright © Materials Research Society 1989

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Footnotes

**

LCMB-Gerontology Research Center, Francis Scott Key Medical Center, Baltimore, MD 21224.

*

This work supported by Office of Naval Research Contract No. N00014-85-K-0175.

References

REFERENCES

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