Microdefects in Al2O3 films and interfaces revealed by positron lifetime spectroscopy

Jun Xu; B. Somieski; L. D. Hulett; B. A. Pint; P. F. Tortorelli; R. Suzuki; T. Ohdaira

doi:10.1063/1.120278

Microdefects in Al₂O₃ films and interfaces revealed by positron lifetime spectroscopy

Jun Xu, B. Somieski, L. D. Hulett, B. A. Pint, P. F. Tortorelli, R. Suzuki, T. Ohdaira

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

We have studied microdefects and interfaces of Al₂O₃ films on iron and nickel aluminide substrates using variable-energy positron lifetime spectroscopy. Di-vacancies, vacancy clusters, and microvoids were observed in the oxide scales. Their sizes and distributions were determined by the nature of the process used to synthesize the alumina film, and influenced by the composition of the alloy substrates. For oxide-iron aluminide interfaces, positron lifetimes are longer than those for the alumina layer itself, suggesting a greater defect concentration at such sites.

Original language	English
Pages (from-to)	3165-3167
Number of pages	3
Journal	Applied Physics Letters
Volume	71
Issue number	21
DOIs	https://doi.org/10.1063/1.120278
State	Published - Nov 24 1997

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abstract = "We have studied microdefects and interfaces of Al2O3 films on iron and nickel aluminide substrates using variable-energy positron lifetime spectroscopy. Di-vacancies, vacancy clusters, and microvoids were observed in the oxide scales. Their sizes and distributions were determined by the nature of the process used to synthesize the alumina film, and influenced by the composition of the alloy substrates. For oxide-iron aluminide interfaces, positron lifetimes are longer than those for the alumina layer itself, suggesting a greater defect concentration at such sites.",

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AU - Tortorelli, P. F.

AU - Suzuki, R.

AU - Ohdaira, T.

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N2 - We have studied microdefects and interfaces of Al2O3 films on iron and nickel aluminide substrates using variable-energy positron lifetime spectroscopy. Di-vacancies, vacancy clusters, and microvoids were observed in the oxide scales. Their sizes and distributions were determined by the nature of the process used to synthesize the alumina film, and influenced by the composition of the alloy substrates. For oxide-iron aluminide interfaces, positron lifetimes are longer than those for the alumina layer itself, suggesting a greater defect concentration at such sites.

AB - We have studied microdefects and interfaces of Al2O3 films on iron and nickel aluminide substrates using variable-energy positron lifetime spectroscopy. Di-vacancies, vacancy clusters, and microvoids were observed in the oxide scales. Their sizes and distributions were determined by the nature of the process used to synthesize the alumina film, and influenced by the composition of the alloy substrates. For oxide-iron aluminide interfaces, positron lifetimes are longer than those for the alumina layer itself, suggesting a greater defect concentration at such sites.

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Microdefects in Al₂O₃ films and interfaces revealed by positron lifetime spectroscopy

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