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Facet-controlled phase separation in supersaturated Au-Ni nanoparticles upon shape equilibration
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SYSNO ASEP 0449995 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Facet-controlled phase separation in supersaturated Au-Ni nanoparticles upon shape equilibration Author(s) Herz, A. (DE)
Friák, Martin (UFM-A) RID, ORCID
Rossberg, D. (DE)
Hentschel, M. (DE)
Theska, F. (DE)
Wang, D. (DE)
Holec, D. (AT)
Šob, Mojmír (UFM-A) RID, ORCID
Schneeweiss, Oldřich (UFM-A) RID, ORCID
Schaaf, P. (DE)Number of authors 10 Source Title Applied Physics Letters. - : AIP Publishing - ISSN 0003-6951
Roč. 107, č. 7 (2015), art.n. 073109Number of pages 5 s. Language eng - English Country US - United States Keywords GENERALIZED GRADIENT APPROXIMATION ; NANOPOROUS GOLD NANOPARTICLES ; AUGMENTED-WAVE METHOD ; ELASTIC-CONSTANTS ; BILAYER ; NICKEL Subject RIV BM - Solid Matter Physics ; Magnetism Institutional support UFM-A - RVO:68081723 UT WOS 000360390500052 EID SCOPUS 84939826425 DOI 10.1063/1.4928627 Annotation Solid-state dewetting is used to fabricate supersaturated, submicron-sized Au-Ni solid solution particles out of thin Au/Ni bilayers by means of a rapid thermal annealing technique. Phase separation in such particles is studied with respect to their equilibrium crystal (or Wulff) shape by subsequent annealing at elevated temperature. It is found that {100} faceting planes of the equilibrated particles are enriched with Ni and {111} faces with Au. Both phases are considered by quantum-mechanical calculations in combination with an error-reduction scheme that was developed to compensate for a missing exchange-correlation potential that would reliably describe both Au and Ni. The observed phase configuration is then related to the minimization of strongly anisotropic elastic energies of Au- and Ni-rich phases and results in a rather unique nanoparticle composite state that is characterized by nearly uniform value of elastic response to epitaxial strains all over the faceted surface. The same conclusion is yielded also by evaluating bi-axial elastic moduli when employing interpolated experimental elastic constants. This work demonstrates a useful route for studying features of physical metallurgy at the mesoscale. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2016
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