Effects of global versus non-overlapping thermal spikes on ion beam mixing efficiency in metals
作者:
E. Ma,
期刊:
Radiation Effects and Defects in Solids
(Taylor Available online 1995)
卷期:
Volume 133,
issue 1
页码: 35-43
ISSN:1042-0150
年代: 1995
DOI:10.1080/10420159508225754
出版商: Taylor & Francis Group
关键词: Ion mixing efficiency;noble metals;transition metals;global spikes;thermal spikes.
数据来源: Taylor
摘要:
Ion mixing efficiency of metals, measured by employing marker experiments at low temperatures (<77 K), varies significantly in magnitude and exhibits different correlations with thermochemical and materials parameters. We have separated the available mixing data into two groups, for noble metals and for other transition metals, respectively, and compared them with phenomenological models formulated based on Vineyard's approach for thermally activated diffusive processes. Two different thermal spike configurations have been considered: well-developed global spikes, and thermal spikes in non-overlapping subcascades. The observed match between model-predicted trends and mixing data suggest that the observed variations in mixing data can be explained in terms of different characters of thermal spike development, i.e., global spikes in noble metals versus non-overlapping spikes in other transition metals. These results are compared with those for ion mixing in bilayers, where different thermal spike mixing behaviours have also been noted. In addition, our estimate of the activation energy for diffusion in thermal spikes is consistent with the notion of a liquid-like diffusion mechanism.
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