Positron annihilation at grain boundaries in metals

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Authors

KURIPLACH Jan MELIKHOVA Oksana HOU M. VAN PETEGEM S. ZHURKIN E. ŠOB Mojmír

Year of publication 2007
Type Article in Periodical
Magazine / Source physica status solidi (c)
MU Faculty or unit

Faculty of Science

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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