A crystalline-to-amorphous transition has been achieved by using an extraction technique which consists in preparing a random $X$-Ag mixture where $X$ is totally inert to I and removing the Ag atoms by exposing the $X$-Ag film to I. The contribution of this study is twofold: First, while it is impossible to produce binary alloys of Ag with either Ru, Rh, Os, or Ir by conventional metallurgical means, deposition at 77 K has produced random substitutional solid solutions stable at room temperature; second, the removal of Ag by I from the crystalline metastable solid solutions yields amorphous films with interesting properties, which are briefly described.

• Received 3 June 1983

DOI:https://doi.org/10.1103/PhysRevB.28.4860