Self-diffusion in nanocrystalline alloys

被引：8

作者：

Kaszkur, Zbigniew ^{[1
]}

Juszczyk, Wojciech ^{[1
]}

Lomot, Dariusz ^{[1
]}

机构：

[1] Inst Phys Chem PAS, PL-01224 Warsaw, Poland

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2015年 / 17卷 / 42期

关键词：

POWDER DIFFRACTION; PD-AG; SURFACES; CHEMISORPTION; PALLADIUM; SILVER; CATALYSTS; GROWTH; FILMS; NO;

D O I：

10.1039/c5cp00312a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：28250 / 28255

页数：6

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