Oxygen nonstoichiometry of A Y(Ba1−xSrx)2Cu3O7−δ superconductor

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Abstract

The oxygen deficit δ of Y(Ba1−xSrx)2Cu3O7−δ was measured as a function of logPO2 and temperature for x=0, 0.1, 0.3 and 0.5. It was found that a constant temperature shift of the δ-logPO2 curve to the lower δ side increases as x increases. Partial molal quantities ΔO2, ΔO2 were calculated from the plots of RTlnPO2 vs. T and RlnPO2 vs. 1/T, respectively. It was found that all the ΔO2−δ plots fall on a single line, irrespective of x, but the -ΔO2 value increases as x increases, especially in a composition range where δ is higher than 0.5. Lattice parameters for different x were measured as a function of δ. Shift of the ortho-tetra phase boundary to the lower δ side increased as x increased. The critical temperature was measured as a function of δ for different x. The plateau on the Tc−δ curve observed for YBCO disappeared by the substitution of strontium for barium.

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