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.
Related projects:	Physical and chemical properties of advanced materials and structures Theoretical studies of structure and magnetic properties of internal interfaces in metallic materials