Positron trapping and annihilation atinterfaces between matrix and cylindrical or spherical precipitates modeled by diffusion-reaction theory

Roland Würschum, Laura Resch, Gregor Klinser

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem Konferenzband

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.
Originalspracheenglisch
TitelThe 18th International Conference on Positron Annihilation (ICPA-18)
UntertitelAIP Conference Proceedings
Seiten050010-1 - 050010-6
Seitenumfang6
Band2182
DOIs
PublikationsstatusVeröffentlicht - 27 Dez 2019

Publikationsreihe

NameAIP Conference Proceedings
Herausgeber (Verlag)American Institute of Physics Publising LLC
ISSN (Print)0094-243X

Fields of Expertise

  • Advanced Materials Science

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