Pressure dependence and isotope effect of self-diffusion in a metallic glass.
Pressure dependence and isotope effect of self-diffusion in a metallic glass.
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DOI：
10.1103/physrevlett.65.1219
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发表时间：
1990-09
影响因子：
8.6
通讯作者：
F. Faupel;P. Hüppe;K. Rätzke
中科院分区：
文献类型：
--
作者：
F. Faupel;P. Hüppe;K. Rätzke
在非晶态Co 76.7 Fe 2 Nb 14.3 B 7和fcc Co中测量了钴扩散的压力依赖性和同位素效应。在实验精度范围内，在Co 76.7 Fe 2 Nb 14.3 B 7中没有发现压力依赖性和同位素效应E=（Dα/Dβ−1）/[（mβ/mα）1/2 −1]=0.1。这些结果表明，在金属玻璃中的扩散不是通过类似于晶体Co的热平衡中的准空位介导的。扩散而是通过涉及约10个原子质量的直接机制发生的
The pressure dependence and isotope effect of cobalt diffusion have been measured in amorphous Co 76.7 Fe 2 Nb 14.3 B 7 and fcc Co. Within experimental accuracy no pressure dependence and an isotope effect E=(Dα/Dβ−1)/[(mβ/mα) 1/2 −1]=0.1 were found in Co 76.7 Fe 2 Nb 14.3 B 7 . These results show that diffusion in the metallic glass is not mediated through quasivacancies in thermal equilibrium similar to crystalline Co. Diffusion rather occurs via a direct mechanism involving about ten atomic masses