Reaction of Ba2YCu3O6.9films with yttriahyphen;stabilized zirconia substrates

摘要

Degradation of Ba2YCu3O6.9films on yttriahyphen;stabilized zirconia substrates is shown to proceed by barium depletion from the film and barium zirconate formation. This process is accompanied by a decrease in the temperature of zero resistivity and ultimately produces Y2Cu2O5and CuO. BaZrO3is, however, found to be inert to Ba2YCu3O6.9at 950thinsp;deg;C. Use of a truly chemically inert substrate material may permit extended heat treatment of films without degradation due to substrate interactions.