Positron lifetime studies of defects in α‐Fe containing helium

Abstract

Abstract Point defects are key factor for determination of properties and characteristics of structural materials. The properties of defects in alpha Fe containing helium atoms have been investigated by model positron lifetime simulations. The electron and positron wave functions have been obtained in the local density approximation to the two‐component density functional theory. The calculated values of the positron lifetime correlate with the magnitude of the electron density. The lifetime of positrons trapped in nano‐voids increases with the size of the voids. The presence of He in the nano‐void decrease the lifetime. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)