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Microstructural and chemical effects in Al2O3 implanted with iron at room temperature and annealed in oxidizing or reducing atmospheres

Published online by Cambridge University Press:  31 January 2011

C.J. McHargue ,
P.S. Sklad ,
C.W. White ,
G.C. Farlow ,
A. Perez  and
G. Marest
C.J. McHargue
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6118
P.S. Sklad
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6118
C.W. White
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6118
G.C. Farlow
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6118
A. Perez
Affiliation:
Département de Physique des Matériaux, Université Claude Bernard Lyon 1, Villeurbanne Cedex, France
G. Marest
Affiliation:
Institut de Physique Nucléaire de Lyon, IN2P3-CNRS, Université Claude Bernard Lyon 1, Villeurbanne Cedex, France
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Abstract

Rutherford backscattering (RBS)-ion channeling, transmission electron microscopy (TEM), and conversion electron Mössbauer spectroscopy (CEMS) have been used to determine the structure of α–Al2O3 implanted with iron at room temperature. Changes produced by post-implantation annealing in oxidizing and reducing atmospheres were followed using the same techniques. Implantation of 160 keV Fe at room temperature produces a damaged but crystalline microstructure for fluences as high as 1 × 1017 Fe/cm2. The iron resides in a variety of local environments: three Fe2+ components, one Fe0 component, and two Fe4+ components. The relative amount of each component varies with implantation fluence. Only the Fe0 component seems to be associated with second-phase formation. In this case, 2 nm diameter α-iron particles were detected by TEM studies. Recovery of implantation-induced disorder in the Al- and oxygen-sublattices occurs in two stages for annealing in oxygen and in one continuous stage for hydrogen-annealing. The end state for iron is Fe3+ for oxygen anneals and Fe0 for hydrogen anneals. The precipitated phases observed are those to be expected from the equilibrium phase diagrams.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 10 , October 1991 , pp. 2145 - 2159
Copyright
Copyright © Materials Research Society 1991

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