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- W1570743411 abstract "In situ sheet resistance and weight measurements have been performed on tetragonal Y1Ba2Cu3O6+ε oxide in an Ar atmosphere in the 550–650°C temperature range. The starting material was orthorhombic Y1Ba2Cu3O6.90. The isothermal annealing produces a decrease in weight due to oxygen losses, quickly transforms the material from orthorhombic to tetragonal, and induces an increase in the sheet resistance value. While the variation in weight ends after 200 min, longer times, about two orders of magnitude more, are necessary to stabilize the value of the resistance. The resistance increases exponentially with a single time constant, and the Arrhenius plot of the time constants measured after three isothermal treatments suggests a process thermally activated with an activation energy of 0.9 ± 0.1 eV. The data are consistent with a microscopic process where ultrafine ordered domains, constituted by short chains in the Cu-O planes embedded in a tetragonal matrix, evolve in a uniformly disordered sample. The homogenization affects the electrical transport properties of the material." @default.
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- W1570743411 date "1990-07-01" @default.
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- W1570743411 title "Oxygen disordering in tetragonal Y1Ba2Cu3O6+ε" @default.
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- W1570743411 doi "https://doi.org/10.1016/0921-4534(90)90076-q" @default.
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