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Abstract
The reaction rate of vacuum-evaporated films of V of the order of 1000 Å thick is investigated by MeV He backscattering spectrometry. On substrates of single-crystal Si and for anneal times up to several hours in the temperature range 570–650°C, VSi2 is formed at a linear rate in time. The activation energy of the process is 1.7±0.2 eV. The presence of oxygen in amounts of 10% can significantly decelerate the reaction. On substrates of SiO2 in the temperature range 730–820°C and anneal times of several hours or less, V3Si is formed at a square-root rate in time. The activation energy of this process is 2.0±0.2 eV.
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