Direct Evidence for Cation Non-Stoichiometry and Cottrell Atmospheres Around Dislocation Cores in Functional Oxide Interfaces

作者：Arredondo Miryam; Ramasse Quentin M; Weyland Matthew; Mahjoub Reza; Vrejoiu Ionela; Hesse Dietrich; Browning Nigel D; Alexe Mann; Munroe Paul; Nagarajan Valanoor^*

来源：Advanced Materials, 2010, 22(22): 2430-+.

DOI：10.1002/adma.200903631

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.

• 出版日期2010-6-11