Facet-controlled phase separation in supersaturated Au-Ni nanoparticles upon shape equilibration

被引:22
作者
Herz, A. [1 ,2 ]
Friak, M. [3 ,4 ]
Rossberg, D. [1 ,2 ]
Hentschel, M. [1 ,2 ]
Theska, F. [1 ,2 ]
Wang, D. [1 ,2 ]
Holec, D. [5 ]
Sob, M. [3 ,4 ,6 ]
Schneeweiss, O. [3 ]
Schaaf, P. [1 ,2 ]
机构
[1] Tech Univ Ilmenau, Inst Mat Sci & Engn, Dept Mat Elect & Elect Engn, D-98693 Ilmenau, Germany
[2] Tech Univ Ilmenau, Inst Micro & Nanotechnol MacroNano, D-98693 Ilmenau, Germany
[3] Acad Sci Czech Republ, Inst Phys Mat, Vvi, CZ-61662 Brno, Czech Republic
[4] Masaryk Univ, CEITEC MU, Cent European Inst Technol, CZ-62500 Brno, Czech Republic
[5] Univ Leoben, Dept Phys Met & Mat Testing, A-8700 Leoben, Austria
[6] Masaryk Univ, Fac Sci, Dept Chem, CZ-61137 Brno, Czech Republic
关键词
GENERALIZED GRADIENT APPROXIMATION; ELASTIC-CONSTANTS; NICKEL;
D O I
10.1063/1.4928627
中图分类号
O59 [应用物理学];
学科分类号
摘要
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. (C) 2015 AIP Publishing LLC.
引用
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页数:5
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