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Elastic After-Effect Due to Oxygen Relaxation in Yba2Cu3O7−δAbove Tc

Published online by Cambridge University Press:  26 February 2011

J. R. Cost ,
P. E. Armstrong ,
R. B. Poeppel  and
J. T. Stanley
J. R. Cost
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
P. E. Armstrong
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
R. B. Poeppel
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
J. T. Stanley
Affiliation:
Arizona State University, Tempe, AZ 85281
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Abstract

Isothermal elastic after-effect measurements to obtain relaxation times for the stress-induced motion of oxygen in YBa2Cu3O7−δ have been made from 50°C to 110°C. These results extend our previous internal friction measurements of the same oxygen relaxation to lower temperatures. The combined results, which cover nine orders of magnitude in relaxation time, show a classical Arrhenius temperature dependence, activation energy Q−1.13±0.01 eV and attempt frequency τ0−1.6×10−13 s (log τ0−.12.79±0.13). The mechanism of the relaxation is considered to be stress-induced ordering of oxygen atoms on theCuO basal plane. Diffusivities obtained from these results are compared with those from tracer diffusion of oxygen.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 819
Copyright
Copyright © Materials Research Society 1991

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References

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