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Direct Evidence for Cation Non‐Stoichiometry and Cottrell Atmospheres Around Dislocation Cores in Functional Oxide Interfaces
Author(s) -
Arredondo Miryam,
Ramasse Quentin M.,
Weyland Matthew,
Mahjoub Reza,
Vrejoiu Ionela,
Hesse Dietrich,
Browning Nigel D.,
Alexe Marin,
Munroe Paul,
Nagarajan Valanoor
Publication year - 2010
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200903631
Subject(s) - materials science , dislocation , stoichiometry , oxide , crystallography , chemical physics , nanotechnology , chemistry , composite material , metallurgy , physics
Long‐range strain fields associated with dislocation cores at an oxide interface are shown to be sufficient enough to create significant variations in the chemical composition around the core (Cottrell atmospheres). Such stress‐assisted diffusion of cations towards the cores is proposed to significantly impact the properties of nanoscale functional devices. The figure shows a Z‐contrast image of a single dislocation core at an oxide interface.