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A MÖssbauer Study of Nanophase iron Produced by Mechanical Alloying

Published online by Cambridge University Press:  25 February 2011

Yanxia Lu ,
R. C. Reno  and
L. Takacs
Yanxia Lu
Affiliation:
Department of Physics, University of Maryland Baltimore County, 5401 Wilkens Avenue, Catonsville MD 21228
R. C. Reno
Affiliation:
Department of Physics, University of Maryland Baltimore County, 5401 Wilkens Avenue, Catonsville MD 21228
L. Takacs
Affiliation:
Department of Physics, University of Maryland Baltimore County, 5401 Wilkens Avenue, Catonsville MD 21228
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Abstract

Ball milling has been used to mechanically induce the displacement reaction 3Fe3O4 + 8 Al → 9 Fe + 4 A12O3, in which fine magnetite particles (Fe3O4) are reduced to nanophase iron particles. The presence of initial, intermediate, and final phases are easily identified by Mössbauer spectroscopy on samples taken at various stages of the milling process.

Our measurements confirm the gradual progress of the above reaction and also verify the presence of FeAl2O4 at intermediate milling times. The concentration of this phase reaches a maximum of 42% at a milling time of 100 minutes. After five hours, the sample is fully reduced and contains ferromagnetic bcc-iron and superparamagnetic iron particles. Further milling reduces the amount of ferromagnetic iron and increases the proportion of the superparamagnetic phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 286: Symposium J – Nanophase and Nanocomposite Materials , 1992 , 215
Copyright
Copyright © Materials Research Society 1993

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References

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