A study of oxygen interaction with high-temperature superconducting materials by the isotopic exchange method
Abstract The isotopic exchange method was used to determine the exchange rate of oxygen of YBa 2 Cu 3 O 7−δ , Bi 2 Sr 2 CaCu 2 O 8+δ , Bi 1.6 Pb 0.4 Sr 1.6 Ca 2.4 Cu 3.4 O 10.2+δ and Pb 2 Sr 2 Y 0.5 Ca 0.5 Cu 3 O 8+δ with molecular oxygen. The measurements were made at temperatures of 600–1000 K and oxygen pressures of 3–15 Torr. The activation energy and the order of the gas-pressure dependence of the oxygen exchange reaction rate were determined.