|
Equilibrium structure
of binary alloy nanocrystals
| Recently, much attention has turned to the
fabrication of embedded
binary alloy nanostructures including core/shell and lobe/lobe
configurations. We consider the equilibrium structure of embedded
nanocrystals fromed from strongly segregating binary alloys within a
simple thermodynamic model. The model identifies two dimensionless
interface energies that dictate the structure and allows prediction of
the stable structure for any choice of these parameters. The resultant
structure map includes threee distinct nanocrystal morphologies:
core/shell, lobe/lobe, and completely separated spheres. |
Structure map for binary alloy nanocrystals. The matrix is assumed to
be isotropic. γ1 and γ2 are the α/matrix and
β/matrix interface energies, scaled by the α/β interface energy. The
volume ratio between α and β is 1:1.
|
References
|
1. C. W.
Yuan, S. J. Shin, C. Y. Liao, J. Guzman, P. R.
Stone, M. Watanabe, J. W. Ager, III, E. E. Haller and D. C. Chrzan, in
preparation
2. Q. Xu, I. D. Sharp, C. W. Yuan, D. O. Yi, C. Y.
Liao, A. M. Minor, J. W. Beeman, M. C. Ridgway, J. W. Ager, III, D. C.
Chrzan and E. E. Haller, Phys. Rev. Lett., volume 97, 155701 (2006)
|
|
|