Publication

Nucleation kinetics on inhomogeneous substrates: Al/Au(111)

Klaus Kern, Harald Brune
1999
Journal Articles

Abstract

We report a quantitative atomic scale study of nucleation kinetics on an inhomogeneous substrate. Our model system, Al/Au(111)-(root 3 x 22), reveals a distinct nucleation transition due to the repulsive nature of surface dislocations. Whereas for T < 200 K Al adatoms are confined to quasipseudomorphic stacking areas experiencing a very small diffusion barrier (30 +/- 5 meV), at T > 200 K surface dislocations, representing repulsive barriers of Delta E approximate to 560 meV, can be surmounted. The results illustrate the significance of surface dislocations as repulsive line defects in nucleation and growth.

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https://infoscience.epfl.ch/entities/publication/67d48623-6d6c-4789-9699-91dec5fccd3e

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Klaus Kern, Harald Brune
1999
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/67d48623-6d6c-4789-9699-91dec5fccd3e

About this result

Related concepts (24)

Dislocation

In materials science, a dislocation or Taylor's dislocation is a linear crystallographic defect or irregularity within a crystal structure that contains an abrupt change in the arrangement of atoms. The movement of dislocations allow atoms to slide over each other at low stress levels and is known as glide or slip. The crystalline order is restored on either side of a glide dislocation but the atoms on one side have moved by one position. The crystalline order is not fully restored with a partial dislocation.

Nanoparticle

A nanoparticle or ultrafine particle is usually defined as a particle of matter that is between 1 and 100 nanometres (nm) in diameter. The term is sometimes used for larger particles, up to 500 nm, or fibers and tubes that are less than 100 nm in only two directions. At the lowest range, metal particles smaller than 1 nm are usually called atom clusters instead.

Recrystallization (metallurgy)

In materials science, recrystallization is a process by which deformed grains are replaced by a new set of defect-free grains that nucleate and grow until the original grains have been entirely consumed. Recrystallization is usually accompanied by a reduction in the strength and hardness of a material and a simultaneous increase in the ductility. Thus, the process may be introduced as a deliberate step in metals processing or may be an undesirable byproduct of another processing step.

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Nucleation kinetics on inhomogeneous substrates: Al/Au(111)

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