Scientific article

Comparative study of oxygen diffusion in rare earth REBa2Cu3O7−δ single crystals (RE=Y, Er, Dy) with different impurity levels

Published inPhysica C: Superconductivity and Its Applications, vol. 306, no. 3-4, p. 188-198
Publication date1998

We report on measurements of the chemical diffusion coefficients of rare earth cuprate single crystals REBa2Cu3O7−δ (RE=Y, Er, Dy) grown in crucibles made of Y2O3-stabilized ZrO2 and BaZrO3. The diffusion coefficients have been determined by in situ measurement of the electrical conductivity using a four point method during the oxygenation at various oxygen partial pressures and in the temperature range of 390°C–550°C. In this range the diffusion coefficient was determined between 3.7×10−9 cm2/s and 6.6×10−8 cm2/s independent of the rare earth atom or of the different impurity levels. For all crystals we show that the in- and out-diffusion process can be described with the same time constant at each annealing temperature. Within the accuracy of ±5% we measure for both processes the same value for the diffusion coefficient. The temperature dependence of the diffusion coefficient obeys an Arrhenius-law for all crystals, proving that the oxygen diffusion in the rare earth RE 123 superconductors is a purely thermally activated process. The values for the activation energy show a scattering up to 30% and vary from 0.76 to 1.09 eV. There is neither a dependence of the activation energy on the central rare earth atom nor on different impurity levels.

  • Conductivity measurements
  • Diffusion coefficient
  • REBa2Cu3O7−δ single crystals
  • Activation energy
Citation (ISO format)
KLÄSER, Marion et al. Comparative study of oxygen diffusion in rare earth REBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−δ</sub> single crystals (RE=Y, Er, Dy) with different impurity levels. In: Physica C: Superconductivity and Its Applications, 1998, vol. 306, n° 3-4, p. 188–198. doi: 10.1016/S0921-4534(98)00371-2
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Article (Published version)
ISSN of the journal0921-4534

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