Fabrication of High Temperature Superconducting Films Using Perfluoro-Organometallic Precursors
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Preparation of high quality films of superconducting ceramics using solution cast organometallic precursors can be hampered by residual carbon contaminants that concentrate at grain boundaries. These contaminants act to decouple grains leading to broadened superconductivity transitions, low critical currents and poor magnetic field response. These problems are minimized through the use of perfluroalkyl carboxylate and related salts of the metal atom constituents. The perfluoro derivatives, in contrast to the hydrocarbon analogues, decompose by nearly complete volatilization. Further, shorter chain perfluoroalkyls can be used to affect solubility in organic solvents which means less weight loss on decomposition, and, as such, less contraction and cracking.