Equilibrium Segregation to Free Surface:Kinet ics and Experiment

曹则贤; Ralf Mueller; 王恩哥; 聂玉昕

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Equilibrium Segregation to Free Surface:Kinet ics and Experiment

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Fick''s first law is modified with an additional term df(x)/dx to describe the segregation phenomenon,f(x)is a local,analytical function related to the depth profile at equilibrium.It thus can be determined experimentally by depth profiling technique.Segregation starting in an initially homogeneous solid is described by an inhomogeneous diffusion equation on the half-infinite domain.Segregation with and without formation of overlayer suggests different boundary conditions.The solution for the Ansatz f(x)=as exp(-x/d_(s))is in perfect agreement with experimental results on sulphur segregation to the surface of titanium.Independent from the detailed kinetics,activation energy can be inferred from the surface concentration evolution under different temperatures.For sulphur segregation in titanium,E_(act)=718 meV/atom.

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《中国物理快报：英文版》 |1999年第5期|P.364-366|共3页
作者
曹则贤; Ralf Mueller; 王恩哥; 聂玉昕;
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作者单位

State Key Laboratory for Surface Physics Institute of Physics Chinese Academy of Sciences Beijing 100080Department of Physics University Kaiserslautern 67653 Kaiserslautern Germany;

Department of Physics University Kaiserslautern 67653 Kaiserslautern Germany;

State Key Laboratory for Surface Physics Institute of Physics Chinese Academy of Sciences Beijing 100080;

State Key Laboratory for Surface Physics Institute of Physics Chinese Academy of Sciences Beijing 100080;

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原文格式 PDF
正文语种 chi
中图分类金属学与热处理;
关键词
technique.; titanium; sulphur;

Equilibrium Segregation to Free Surface:Kinet ics and Experiment

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