Triple Junction Transport and the Impact of Grain Boundary Width in Nanocrystalline Cu

Triple junctions (TJ), singular topological defects of the grain boundary (GB) structure, get a dominant role for grain growth and atomic transport in nanocrystalline matter. Here, we present detailed measurements by atom probe tomography, even of the temperature dependence of TJ transport of Ni in...

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Bibliographic Details
Published in:Nano letters 2012-07, Vol.12 (7), p.3448-3454
Main Authors: Chellali, Mohammed Reda, Balogh, Zoltan, Bouchikhaoui, Houari, Schlesiger, Ralf, Stender, Patrick, Zheng, Lei, Schmitz, Guido
Format: Article
Language:English
Subjects:
ACTIVATION ENERGY
Atomic structure
BOUNDARIES
Condensed matter: structure, mechanical and thermal properties
Copper
Crystal defects
CRYSTAL STRUCTURE
DEFECTS
DIFFUSION
Diffusion in nanoscale solids
Diffusion in solids
Diffusion rate
Exact sciences and technology
Grain boundaries
IMPACT PROPERTIES
LATTICE DEFECTS
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Merging
MOLECULAR STRUCTURE
Nanocrystals
Physics
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Transport
Transport properties of condensed matter (nonelectronic)
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Summary:Triple junctions (TJ), singular topological defects of the grain boundary (GB) structure, get a dominant role for grain growth and atomic transport in nanocrystalline matter. Here, we present detailed measurements by atom probe tomography, even of the temperature dependence of TJ transport of Ni in nanocrystalline Cu in the chemical regime of interdiffusion. An unexpected variation of the effective width of merging GBs with temperature is detected. It is demonstrated that proper measurement of TJ transport requires taking into account this remarkable effect. TJ diffusion is found to be a factor of about 200 faster than GB diffusion. Its activation energy amounts to only two-thirds of that of the GB.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl300751q