The superconductivity of the ceramic solid YBa2Cu3O7 − δ, prepared by heating Y2O3, BaCO3 and CuO at 920°C for 22 h, was checked by the Meissner effect. Chemical analysis established the formula of the compound prepared. A thermostated aqueous suspension of the superconductor, treated with a solution of H2O2, produced oxygen, whose volume was measured at intervals in a gas burette. From the initial rates of the first‐order reaction at different temperatures, the activation enthalpy and entropy were 1…
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