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Alloying can be complex to understand because at least three different elements are involved Au, As, Ga. Therefore a ternary phase diagram must once again be studied in order to decide temperatures that would allow for eutectic stable liquid (eutectic point is the lowest melting point achieved by a mixture of metals) or solid alloys. \cite{Joyce_2011}   Vapor-liquid-solid-hydride vapor phase epitaxy (VLS-HVPE) is a technique that has allowed for the growth of exceptionally long (tens of micrometers) and defect free NW with a mean diameter of 50 nm. A gold monoloayer is placed on top of a GaAs substrate. The GaCl precursors allow for exceptionally fast decomposition and hence delivery of Ga for NW growth. In addition, the Cl species suppress radial growth of the NW. The assumption of fast Ga atom delivery to the liquid catalyst has been modeled, modeled by Andre and co-workers,  resulting in good agreement. The model is agreement.\cite{Andr__2014}  Although VLS and MOCVD are techniques that have been commonly used for decades there is doubt about the mechanism of growth mentioned earlier. \cite{Persson_2004} \cite{Dick_2005} In particular a solid phase diffusion mechanism instead of liquid phase for GaAs nanowire growth has been proposed. \cite{Persson_2004} An experiment growing two types of GaAs nanowires, differing only in method growth termination, was conducted. Method one included switching off the Ga pressure while maintaining As pressure, and method two involved switching off the gas supply of both at the same time. X-ray energy dispersive spectrometry reveal the ratio of Ga and As in the nanowire body and seed particle, results conclude that the concentration of Ga for eutectic melt is never reached, suggesting a solid phase mechanism. \cite{Persson_2004}