Publication details
Positron annihilation at grain boundaries in metals
| Authors | |
|---|---|
| Year of publication | 2007 |
| Type | Article in Periodical |
| Magazine / Source | physica status solidi (c) |
| MU Faculty or unit | |
| Citation | |
| Web | http://www3.interscience.wiley.com/cgi-bin/abstract/114802369/ABSTRACT |
| Field | Solid matter physics and magnetism |
| Keywords | positron annihilation; grain boundaries; electronic structure |
| Description | Positron annihilation at selected tilt and twist grain boundaries in iron and nickel is examined theoretically. First the atomic structure of studied perfect and imperfect grain boundaries is obtained using molecular dynamics simulations. Characteristics of positrons trapped at such GBs are then calculated employing the atomic superposition method and are related to free volumes found at GBs. It is observed that in some cases vacancies introduced into ideal grain boundaries do not result in an increase of the positron lifetime. |
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