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Fast Diffusion of Iron in Single Crystal Rutile and Iron Doped Rutile

Published online by Cambridge University Press:  21 February 2011

J. Sasaki ,
N. L. Peterson  and
L. C. De Jonghe
J. Sasaki
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
N. L. Peterson
Affiliation:
Argonne National Laboratory, 9700 South Cass Av., Argonne, IL 60439
L. C. De Jonghe
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
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Abstract

Tracer diffusion coefficients of Fe, DFe* in single crystals of rutile and of 0 –2.0% Fe doped rutile were measured. The oxygen pressure dependence of DFe* in pure rutile showed complicated behavior. The values of DFe* may consist of contributions from Fe2+ ions diffusing by an interstitial mechanism and from Fe3+ ions diffusing by an interstitialcy mechanism in cooperation with tetravalent titanium interstitial ions, Tii. The value of DFe* in Fe doped rutile attains a saturation value when the Fe content reaches about 0.1%, D*Fe decreases drastically when the Fe content exceeds about 0.35%. Complex impedance measurements of electrical conductivity indicate the existence of ionic conduction for Fe doped rutile containing less than 0.35% of Fe. The small ionic conductivity relative to the values of D*Fe suggests that only a small fraction of the iron ions are highly mobile. Above 0.35% Fe, the observed drastic decrease in D*Fe may result from the formation of a shear structure In highly doped rutile.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 24: Symposium B – Defect Properties and Processing of High-Technology Nonmetallic Materials , 1983 , 39
Copyright
Copyright © Materials Research Society 1984

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References

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