Icosahedral and amorphous structures have been produced in multilayered Al-V by ion-beam mixing. In contrast to the possibilities with the Al-Mn alloy system, we find that the formation of ‘‘single-phase’’ icosahedral Al-V at higher temperatures is inhibited by a coexisting, as yet unreported, bcc phase (a=3.82 Å). When the mixing is performed with 500-keV ${\mathrm{Xe}}^{+}$, transmission-electron-microscopy (TEM) –amorphous structures have been obtained at liquid-nitrogen temperature in an extended concentration regime (15–26 at. % V). Electrical resistivity data for all the alloys studied show a negative temperature dependence which cannot be explained quantitatively in the framework of current theories. The Hall coefficient in glassy Al-V is found to change sign and become positive above 16 at. % V. This fact is discussed in the context of existing theories for the sign of the Hall coefficient. As far as we know, this is the first time such a change of sign has been observed for a nonmagnetic glassy metallic system which is not of the ‘‘early-late’’ transition-metal type.

• Received 6 January 1989

DOI:https://doi.org/10.1103/PhysRevB.39.9874