论文标题
空位介导的二维表面合金中相位分离的抑制作用通过原子跳速的差异
Vacancy-mediated suppression of phase separation in a model two-dimensional surface alloy by the difference of the atomic jump rates
论文作者
论文摘要
空位介导的集体扩散模型用于计算典型的FCC BI-金属表面合金中的热诱导（Spinodal）相分离，以低位置空位浓度，重点是$γ=γ_A/γ_b$，$γ_A/γ_b$的效果，即跳到两种类型的空缺位置的跳跃速率。该模型是用于通过Moleko \ emph {等人}得出的动力学转运系数的一种原子物种和空缺的扩散（Phil。Mag。A59，141（1989））。可以证明，对于$ _ {0.7} $ b $ _ {0.3} $合金，$γ\ sim 50 $会导致相位抑制，而非常小的$γ$值会导致轻度的相位分离（即，抑制不完整）。
A vacancy-mediated collective diffusion model is used to compute a thermally-induced (spinodal) phase separation in a typical fcc bi-metallic surface alloy at low median concentration of vacancies, focusing on the effect of the ratio, $Γ=Γ_A/Γ_B$, of the jump rates to the vacant sites of the two types of atoms. The model is formulated for the diffusion of one atomic species and vacancies, employing the kinetic transport coefficients derived by Moleko \emph{et al.} (Phil. Mag. A 59, 141 (1989)). It is demonstrated that for A$_{0.7}$B$_{0.3}$ alloy, $Γ\sim 50$ results in suppression of phase separation, whereas very small $Γ$ values result in mild phase separation (i.e., the suppression is incomplete).
