Observation of quasimelting at the atomic level in Au nanoclusters

W. Krakow, M. Jóse-Yacamán, J. L. Aragón

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Experimental evidence is presented for the atomic origin of quasimelting of small Au clusters. Real-time high-resolution transmission electron microscopy, an in situ evaporation facility, and the choice of a controlled substrate clearly shows atomic motion adjacent to and on nanoclusters in the <20 size range. We have been able to observe partial melting, atom sharing, absorption of small clusters, and shape adjustment. These phenomena are consistent with low-energy surface sputtering, energy minimization, and diffusive surface migration. Related to the transformation from icosahedral multiply twinned to single crystal observed under low voltage conditions, we propose a geometric model of the transformation which produces a continuum of low-energetic intermediate structures.

Original languageEnglish (US)
Pages (from-to)10591-10596
Number of pages6
JournalPhysical Review B
Volume49
Issue number15
DOIs
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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