Stanford University scientists developed a patented ion beam deposition ("IBAD") technique to economically produce textured thin oxide films with rock-salt-like structure on amorphous substrates. Because rock salt structures tend to have a reasonable lattice match with films such as YBCO (yttrium barium copper oxide) and PZT (lead zirconium titanate), they are attractive for a variety of electronic and electrical applications. The process is particularly well-suited for the preparation of biaxially textured template layers for coated conductor type superconductors.Patent Claim 1:
An article, comprising:
a substrate comprising a metal alloy, the substrate having at least one smooth amorphous surface, wherein the root mean square roughness of said smooth amorphous surface is less than about 100 angstroms; buffer layer comprising a first thin film formed on said amorphous surface of said substrate from a material having a rock-salt-like structure and substantial alignment both in-plane and out-of-plane; and
a second film having substantial alignment both in-plane and out-of-plane formed on a surface of said buffer layer, wherein said first film provides a template for the epitaxial growth of said second film.