Activation Volume for Hf Diffusion in an Amorphous Ni{sub 0.54}Zr{sub 0.46} Alloy
Activation Volume for Hf Diffusion in an Amorphous Ni{sub 0.54}Zr{sub 0.46} Alloy
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DOI：
10.1103/physrevlett.78.697
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发表时间：
1997
影响因子：
8.6
通讯作者：
A. Grandjean;P. Blanchard;Y. Limoge
中科院分区：
文献类型：
--
作者：
A. Grandjean;P. Blanchard;Y. Limoge
本文介绍了Hf在Ni{sub 0.54}Zr{sub 0.46}非晶态合金中扩散的研究结果。我们已经测量了扩散性能与压力和没有压力，高达1GPa。从这些测量中，我们可以推断出扩散的Arrhenius行为，其活化能为0.76eV，指前因子为7.4 × 10{sup -17}m{sup 2}/s。激活体积为8.5{angstrom};{sup 3}。活化体积和活化能通过Keyes关系相关联。然后，我们讨论在何种程度上目前提出的扩散机制，点缺陷，或集体的过程可以测试对这些结果。{版权} {美国物理学会}
In this Letter we present the results of a diffusion study of Hf in a Ni{sub 0.54}Zr{sub 0.46} amorphous alloy. We have measured the diffusion properties with and without pressure, up to 1GPa. From these measurements we can deduce an Arrhenius behavior of the diffusion, with an activation energy of 0.76eV and a pre-exponential factor of 7.4{times}10{sup -17}m{sup 2}/s. The activation volume amounts to 8.5{angstrom};{sup 3}. Activation volume and energy are related by the Keyes relationship. We then discuss to what extent presently proposed diffusion mechanisms, point defects, or collective processes can be tested against these results. {copyright} {ital 1997} {ital The American Physical Society}