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Combined Hrem and Eels Studies of the Electron Beam Induced Reduction of Maximal-Valence Transition-Metal Oxides.

Published online by Cambridge University Press:  28 February 2011

Neil J. Long  and
Amanda K. Petford-Long
Neil J. Long
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ 85287.
Amanda K. Petford-Long
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ 85287.
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Abstract

High resolution electron microscopy has been used in conjunction with electron energy loss spectroscopy to follow the beam-induced reduction of WO3, V2 O5 and CuO, all of which are maximal valence oxides. All three oxides underwent reduction, although there are differences in the reduction pathway: WO3 is reduced directly to the metal by loss of oxygen from the surface layers; CuO is reduced to the metal via at least two intermediate oxides (Cu4 O3 and Cu2O); and V2 05 forms a reduced oxide (possibly V6 O13) and then remains stable. It was possible to drill holes in V2O5 with an intense, small electron probe (using a field-emission electron gun) provided the sample had previously only been exposed to an electron dose below a critical value (<108 e/nm2). Preliminary doses higher than this critical value rendered the oxide immune to hole drilling (but not to a subsequent reduction to the stable oxide mentioned above), suggesting that holes can only be drilled while the material retains the original V2O5 structure.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 74: Symposium A – Beam-Solid Interactions and Transient Processes , 1986 , 299
Copyright
Copyright © Materials Research Society 1987

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References

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