PHASE-SEPARATION DURING FILM GROWTH
PHASE-SEPARATION DURING FILM GROWTH
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DOI：
10.1063/1.351872
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发表时间：
1992-07-15
影响因子：
3.2
通讯作者：
SROLOVITZ, DJ
中科院分区：
文献类型：
--
作者：
ATZMON, M;KESSLER, DA;SROLOVITZ, DJ
推导了描述二元合金共沉积过程中相分离的扩散方程，并在主导表面扩散的极限下求解。线性稳定性分析产生的结果与体旋节线分解类似，只是长波长（可能是所有波长）都是稳定的。通过求解层状和柱对称的扩散方程来研究分解成两相。对于层状几何形状，通常观察到接近相等的体积分数，扩散方程不会产生波长选择标准。如果假设自由能最小化，则可以获得这些。对于圆柱形几何形状，小体积分数的解决方案产生与沉积速率相关的表面扩散长度成比例的域尺寸。
A diffusion equation describing phase separation during co-deposition of a binary alloy is derived, and solved in the limit of dominant surface diffusion. Linear stability analysis yields results similar to bulk spinodal decomposition, except that long, and possibly all, wavelength are stabilized. Decomposition into two phases is investigated by solving the diffusion equation for lamellar and cylindrical symmetry. For the lamellar geometry, typically observed for near-equal volume fractions, the diffusion equation does not yield wavelength selection criteria. These can be obtained if free energy minimization is assumed. For the cylindrical geometry, solutions for small volume fractions yield domain dimensions proportional to the deposition-rate dependent surface diffusion length.