Coupling between bulk thermal defects and surface segregation dynamics
Coupling between bulk thermal defects and surface segregation dynamics
复制标题
体热缺陷与表面偏析动力学之间的耦合
DOI:
10.1103/physrevb.104.085408
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
J. Li, S. Zhang
中科院分区:
文献类型:
--
作者:
J. Li, S. Zhang
Surface segregation is a phenomenon that depends on the delicate interplay between thermodynamic driving forces and kinetic obstacles, for which elevated temperature is often needed to enhance the atom mobility and reach equilibrium. Using the classic system ofunder nonisothermal conditions, herein, we show an adatom process underlying transient surface segregation dynamics through the temperature-change-driven creation and annihilation of thermal vacancies in the bulk and the resulting bulk-surface mass exchanges. This is demonstrated by monitoring the surface composition evolution ofwith temperature changes between 250 and, showing that the increase in temperature decreases monotonically the surface Au concentration as a result of the transfer of more Cu than Au from the bulk to the surface to form Cu-rich clusters of adatoms. Such a bulk thermal defect effect is expected to be universal in inducing the disparity in the bulk-surface mass exchanges of dissimilar atoms in multicomponent materials because of the inherent differences in the vacancy formation energies of the constituent atoms.
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