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- W2086903330 abstract "Metallic multilayers were profiled by alternately sputtering and analyzing thin films of Fe-Al in one case, and Mo-Cr in the other. The two systems have heats of mixing (ΔHm1:1) that are opposite in sign, namely −0.23 eV for Fe-Al and +0.075 eV for Mo-Cr. Sputtering was carried out with 5 keV Ar+ and Auger electron spectroscopy was used for the analysis, the target temperature being variously room temperature, 450, 525, or 600 K. With Fe-Al a well-defined peak broadening was observed as the profiling temperature increased, while with Mo-Cr there was a slight narrowing of the peaks under similar profiling conditions. The results are analyzed in terms of numerical solutions of a diffusion equation which contains terms appropriate not only to ballistic motion but also to the motion of chemically guided residual defects. It is argued that the mixing is fully understandable without invoking an explicit role for thermal spikes. This follows, firstly, from the fact that Fe-Al and Mo-Cr show an opposite response to increasing temperature. Secondly, it follows from the fact that the mixing shows different aspects by changing the temperature by only 75 K (i.e. 450 to 525 to 600 K). A similar conclusion can be reached from other work in which increasing extents of mixing of Fe-Al were observed at 77, 200, 300, 400 and 500 K, as well as in the case of Ag-Ni where a decreasing extent of mixing was observed when passing from 300 to 400 to 600 K. Other examples of important temperature effects include Cr-SiO2, Ni-SiO2 and Ti-SiO2. We conclude that thermal spike effects, if they exist, are contained implicitly within the ballistic component." @default.
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- W2086903330 date "1996-09-01" @default.
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- W2086903330 title "On the question of whether ion-beam mixing of Fe-Al and Mo-Cr multilayers is governed more nearly by ballistic effects, residual defects, or thermal-spike effects" @default.
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- W2086903330 doi "https://doi.org/10.1016/0257-8972(95)02742-4" @default.
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