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Effect of vapors of the simplest alcohols on the structure and properties of YBa2Cu3Oy compounds

ABSTRACT With low-temperature treatments (200–300°C), the effect of alcohol vapors on the structural and electrophysical properties of YBa2Cu3Oy (123) having different oxygen content has been studied. It has been established that CuO and YBa2Cu3Oy are catalysts for the dehydration of alcohols to form water and aldehydes. Similar to the action of water vapors, the treatment in vapors of the simplest alcohols leads to hydration of 123 and its transformation into the pseudo-124 phase. In this case, planar stacking faults are formed to be centres of pinning and can improve the critical characteristics of high-temperature superconductors (HTSС) in magnetic fields. The influence of the alcohol vapors is more ‘mild’ as compared to the treatment in water vapors. At t = 300°C, the alcohols are reducing agents of copper, followed by the decomposition of 123 into simple compounds.