Abstract
An enhanced stability towards corrosion was noted for DyBa2Cu3Oz relative to YBa2Cu3Oz. Between pure and Ca doped films, Ca doped films were found to be more corrosion resistant towards aqueous environment. The observed high corrosion stability in DyBa2Cu3Oz can be explained by the improved microstructure and the absence of c-axis correlated extended defects (EDs), while the remarkable increase in corrosion stability for the Ca doped films is presumed to be due to the notable improvement in the grain boundary region and the absence of ED. It is confirmed that the films with c-axis correlated ED are highly prone to corrosion by moisture.
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