Abstract
A method has been proposed for calculating the lattice parameter of binary substitutional solid solutions, which takes into account the presence of pressure (p) in alloys. The method has been applied to SiGe and CuAu alloys. It has been shown that, at p = 0, the deviation from Vegard’s law (Δl) results from the difference in compressibility and atomic volume between the pure constituent components of the alloys. With increasing pressure, Δl increases. According to our calculations, the Δl(p) of SiGe becomes positive at p0 = 0.685 GPa.
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