Projects per year
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.
|Title of host publication||The 18th International Conference on Positron Annihilation (ICPA-18)|
|Subtitle of host publication||AIP Conference Proceedings|
|Pages||050010-1 - 050010-6|
|Number of pages||6|
|Publication status||Published - 27 Dec 2019|
|Name||AIP Conference Proceedings|
|Publisher||American Institute of Physics Publising LLC|
Fields of Expertise
- Advanced Materials Science
FingerprintDive into the research topics of 'Positron trapping and annihilation atinterfaces between matrix and cylindrical or spherical precipitates modeled by diffusion-reaction theory'. Together they form a unique fingerprint.
- 2 Active
Defects & Transformations of Materials
Klinser, G., Sprengel, W. & Würschum, R.
1/01/13 → …
Project: Research area
Atomic defects in metals and metals oxides
Sprengel, W., Würschum, R., Klinser, G. & Resch, L.
1/01/12 → …
Project: Research project
- 1 Talk at conference or symposium
Diffusion-reaction model for positron trapping at interfaces of spherical precipitates
Roland Würschum (Contributor), Laura Resch (Speaker) & Gregor Klinser (Contributor)23 Aug 2018
Activity: Talk or presentation › Talk at conference or symposium › Science to science