Issue 42, 2015

Self-diffusion in nanocrystalline alloys

Abstract

We report an operando XRD/MS experiment on a nanocrystalline Pd(70%)Ag(30%) alloy supported on silica (10 wt% of metal) monitoring slow reversible Pd (in CO) and subsequently Ag (in He) surface segregation at 673 K. XRD data following CO and He flow show structural changes that can be modeled and interpreted in terms of the diffusion phenomena within a typical metal nanocluster. Qualitative differences in the rate of both segregation processes suggest different diffusion mechanisms as the Pd segregation involves vacancy depletion. The experimental details suggest that this kind of experiment can provide a very sensitive response to subtle changes at the surface of nanoclusters. Segregation processes can be stopped at any time by lowering the temperature below 573 K which allows engineering of the metal surface e.g. preparing for a catalytic low temperature reaction on a well-defined surface.

Graphical abstract: Self-diffusion in nanocrystalline alloys

Article information

Article type
Paper
Submitted
18 jan. 2015
Accepted
14 apr. 2015
First published
15 apr. 2015

Phys. Chem. Chem. Phys., 2015,17, 28250-28255

Author version available

Self-diffusion in nanocrystalline alloys

Z. Kaszkur, W. Juszczyk and D. Łomot, Phys. Chem. Chem. Phys., 2015, 17, 28250 DOI: 10.1039/C5CP00312A

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