Determination of Size Effects during the Phase Transition of a Nanoscale Au-Si Eutectic

作者：Kim B J^*; Tersoff J; Wen C Y; Reuter M C; Stach E A; Ross F M

来源：Physical Review Letters, 2009, 103(15): 155701.

DOI：10.1103/PhysRevLett.103.155701

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.

• 出版日期2009-10-9
• 单位IBM