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Oxygen In-Diffusion and Out-Diffusion in Single Crystal Yba2Cu3O7−δ

Published online by Cambridge University Press:  26 February 2011

John R. Lagraff
Affiliation:
Department of Materials Science and Engineering and Materials Research Laboratory, The University of Illinois at Urbana-Champaign, Urbana, IL 61801.
Pengdi Han
Affiliation:
Department of Materials Science and Engineering and Materials Research Laboratory, The University of Illinois at Urbana-Champaign, Urbana, IL 61801.
David A. Payne
Affiliation:
Department of Materials Science and Engineering and Materials Research Laboratory, The University of Illinois at Urbana-Champaign, Urbana, IL 61801.
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Abstract

Isothermal resistance measurements were used to monitor oxygen indiffusion and out-diffusion in single crystal YBa2Cu3O7−δ from 600-780°C. Measurements on single crystals reveal that oxygen out-diffusion is intrinsically faster than in-diffusion, which is contrary to the rates observed in other studies for polycrystalline ceramics. Oxygen out-diffusion measurements suggest two different mechanisms, one above an4 one below ˜680°C,which have activation energies of 1.57±0.06eV and 1.00±0.04eV, respectively. Calculation of relaxation times for oxygen in-diffusion into initially tetragonal YBa2Cu3O7−δ suggest a single mechanism from 600-780°C with an activation energy of 1.16±0.06eV.

Type
Research Article
Copyright
Copyright © Materials Research Society 1991

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References

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