Abstract
AbstractThe superconducting Bi2Sr2CaCu2O8 + x phase is deposited on polycrystalline silver substrates by halide CVD in the temperature interval 760–820° C. Metal iodides and oxygen are used as precursor materials. The films grow with a pronounced [001] orientation, and a superconducting critical temperature of about 80 K was observed without any post‐annealing. As far as the authors know, this is the first report of in situ CVD of the Bi‐2212 phase on silver substrates. Some of the films were postannealed in a two‐step process. The [001] orientation was now considerably improved, but the superconducting critical temperature was reduced to about 75 K.
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