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Influence of Interaction Range on Computed Peierls Stress and Dislocation Displacement in B.C.C. Lithium
Author(s) -
Beauchamp P.,
Prevost J.
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221170209
Subject(s) - peierls stress , glide plane , radius , dislocation , core (optical fiber) , lithium (medication) , crystal twinning , condensed matter physics , plane (geometry) , stress (linguistics) , range (aeronautics) , displacement (psychology) , crystallography , physics , materials science , geometry , chemistry , mathematics , optics , dislocation creep , composite material , philosophy , microstructure , computer security , psychotherapist , endocrinology , linguistics , computer science , psychology , medicine
The simple form of interaction between [111] rows deduced from pseudo‐potential theory is used to compute the core structure, the Peierls stress and the glide plane of a a /2 [111] screw dislocation at 0 K in b.c.c. lithium. Particular attention is given to the influence of the cut‐off radius of the row interaction. It is found that the unstressed core structure and the stresses producing a movement of the dislocation are only weakly dependent on the cut‐off radius. The glide plane is either {112} twinning or {112} antitwinning depending on the range of row interaction so that one cannot forecast what it could be if interactions are taken into account completely.