Abstract
The phase diagram of a nanoscale system can be substantially different than in the bulk, but quantitative measurements have proven elusive. Here we use in situ microscopy to observe a phase transition in a nanoscale system, together with a simple quantitative model to extract the size effects from these measurements. We expose a Au particle to disilane gas, and observe the transition from a two-phase Au + AuSi system to single-phase AuSi. Size effects are evident in the nonlinear disappearance of the solid Au. Our analysis shows a substantial shift in the liquidus line, and a discontinuous change in the liquid composition at the transition. It also lets us estimate the liquid-solid interfacial free energy.
Keywords
LIQUID-SOLID GROWTH; ALLOY PARTICLES; EQUILIBRIUM; NUCLEATION; NANOWIRES; GE
Citation
DOI: 10.1103/PhysRevLett.103.155701
Date of this Version
10-2009
Recommended Citation
Kim, B J.; Tersoff, J; Wen, C Y.; Reuter, M C.; Stach, E A.; and Ross, F M., "Determination of Size Effects during the Phase Transition of a Nanoscale Au-Si Eutectic" (2009). Birck and NCN Publications. Paper 570.
https://docs.lib.purdue.edu/nanopub/570