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SynopsisA method has been developed to cast novel organic/inorganic hybrid films from multicomponent solutions containing titanium alkoxides, poly (n-butyl methacrylate), water, and isopropanol of prescribed compositions. The sol-gel reactions and controlled drying procedure yielded materials of mechanical integrity for which the multistep thermal degradation profile of the organic polymer has been significantly modified. A crystallization exotherm, presumably due to anatase formation, is seen for tetraethyl titanate-derived films beyond the organic degradation temperature. The trend of mechanical tensile parameters with increasing Ti oxide content depicts progressive material strengthening. FT-IR as well as the thermal and mechanical studies of these films suggest a highly unconnected and heterogeneous Ti oxide phase.

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Using a previously reported low-energy sputtering technique, Nb-Ge films have been prepared with superconducting T c 's up to ~ 23 K. High-field, x-ray, and annealing results are reported for these highest-T c films. A discussion of the critical parameters required to achieve the highest transition temperatures in the Nb-Ge system is given. Also further arguments in support of the theories that these highest T c 's are due to the formation of the stoichiometric NbJGe phase in the sputtered films are presented.