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Abstract
The exact solution of a diffusion-reaction model for the trapping and annihilation of positrons at interfaces of precipitate-matrix composites is presented considering both cylindrical or spherical precipitates. Diffusion-limitation is taken into account for interfacial trapping from the surrounding matrix as well as from the interior of the precipitate. Closed-form expressions are obtained for the mean positron lifetime and for the intensity of the positron lifetime component associated with the interface- trapped state. The model contains as special case also positron trapping at extended open-volume defects like spherical voids or hollow cylinders. This makes the model applicable to all types of cylindrical- and spherical-shaped extended defects irrespective of their size and their number density.
Originalsprache | englisch |
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Titel | The 18th International Conference on Positron Annihilation (ICPA-18) |
Untertitel | AIP Conference Proceedings |
Seiten | 050010-1 - 050010-6 |
Seitenumfang | 6 |
Band | 2182 |
DOIs | |
Publikationsstatus | Veröffentlicht - 27 Dez. 2019 |
Publikationsreihe
Name | AIP Conference Proceedings |
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Herausgeber (Verlag) | American Institute of Physics Publising LLC |
ISSN (Print) | 0094-243X |
Fields of Expertise
- Advanced Materials Science
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Atomare Defekte in Metallen und Keramiken
Sprengel, W., Würschum, R., Klinser, G. & Resch, L.
1/01/12 → …
Projekt: Forschungsprojekt
Aktivitäten
- 1 Vortrag bei Konferenz oder Fachtagung
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Diffusion-reaction model for positron trapping at interfaces of spherical precipitates
Roland Würschum (Beitragende/r), Laura Resch (Redner/in) & Gregor Klinser (Beitragende/r)
23 Aug. 2018Aktivität: Vortrag oder Präsentation › Vortrag bei Konferenz oder Fachtagung › Science to science