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Diffusion of Sr in Bi2Sr2Can–1CunO2n+4

Published online by Cambridge University Press:  03 March 2011

Nan Chen ,
S.J. Rothman  and
J.L. Routbort
Nan Chen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4838
S.J. Rothman
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4838
J.L. Routbort
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4838
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Abstract

Tracer diffusion of 85Sr in polycrystalline Bi2Sr2Can-1CunO2n+4 has been investigated for n = 1, 2, and 3 in an oxygen atmosphere between 775 and 850 °C. A radiotracer serial-sectioning technique was used to measure the concentration profiles, which were fit to a solution of the diffusion equation to calculate the diffusivities. The activation energies were 403, 553, and 519 kJ/mole, for n = 1, 2, and 3, respectively. However, the absolute values of D for the various layered superconductors did not differ by more than an order of magnitude over the measured temperature range. The diffusivity of Sr at 800 °C for n = 1 or 2 over an oxygen partial pressure range of 103 to 105 Pa increased as the pressure decreased.

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Articles
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Journal of Materials Research , Volume 8 , Issue 10 , October 1993 , pp. 2465 - 2470
Copyright
Copyright © Materials Research Society 1993

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References

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