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Oxygen diffusion in La2−x Srx CuO4−y

Published online by Cambridge University Press:  31 January 2011

J. L. Routbort,
S. J. Rothman,
B. K. Flandermeyer,
L. J. Nowicki and
J. E. Baker
J. L. Routbort
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
S. J. Rothman
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
B. K. Flandermeyer
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
L. J. Nowicki
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
J. E. Baker
Affiliation:
Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
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Abstract

Diffusion of 18O in the superconductor La2−x Srx CuO4−y has been measured as a function of x (0 to 0.20) between 300 and 500°C at an oxygen partial pressure of ≍ 1 atm. Concentration profiles were obtained using a secondary ion mass spectrometer. The diffusion coefficient decreases with increasing Sr additions from 0.1 to 0.2, primarily because of an increase in activation energy. This result, which is contradictory to the expectation that the diffusion coefficient should increase with increasing vacancy concentration caused by the added Sr, can be explained if oxygen vacancies are bound to Sr clusters. Measurements on samples with x = 0 or 0.05 were unsuccessful, probably because of porosity.

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Type
Articles
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Journal of Materials Research , Volume 3 , Issue 1 , February 1988, pp. 116 - 121
Copyright
Copyright © Materials Research Society 1988

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References

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