Abstract
The partial molar enthalpy of incorporation of oxygen (Δ ox H) and enthalpy of formation (Δ f H) have been measured via high-temperature reaction calorimetry for YBa 2Cu 3− x M x O y (where M=Ni, Zn) in the composition range 0.0< x<0.18. Δ ox H and Δ f H values were nearly independent of dopant for both Ni and Zn, with enthalpies of oxidation in the range −86 to −110 kJ/(mol 1 2 O 2) and enthalpies of formation in the range −110 to −118 kJ/mol. The independence of thermodynamic behavior from superconducting properties is consistent with an electronic mechanism for T c suppression in Zn-doped YBCO superconductors. Oxygen contents, lattice parameters, and T c measurements are also reported.
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