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Studies of weight changes and oxygen diffusion in oxide superconductorsa)

Published online by Cambridge University Press:  31 January 2011

S-F. Lau ,
A.B. Rosenthal ,
N.P. Pyrros ,
J.A. Graham  and
H.N. Gheng
S-F. Lau
Affiliation:
Hercules Incorporated, Research Center, Wilmington, Delaware 19894
A.B. Rosenthal
Affiliation:
Hercules Incorporated, Research Center, Wilmington, Delaware 19894
N.P. Pyrros
Affiliation:
Hercules Incorporated, Research Center, Wilmington, Delaware 19894
J.A. Graham
Affiliation:
Hercules Incorporated, Research Center, Wilmington, Delaware 19894
H.N. Gheng*
Affiliation:
Hercules Incorporated, Research Center, Wilmington, Delaware 19894
*
b)Address correspondence to this author.
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Abstract

In sintering and annealing of ceramic superconductors, diffusion of oxygen and sample weight changes are two important parameters to understand. In this work, we have undertaken to make weight loss measurements at different temperatures. At 400–600 °C, the weight loss data can be simply interpreted via one diffusion process. The Arrhenius activation energy is found to be ca. 23 kcal/mole. At 500 °C, the isotropic diffusion constant was found to be 9.5 × 10−12 cm2/s. Above 600 °C, the weight loss curves become complex and indicate the occurrence of two diffusion processes. The oxygen loss and the oxygen uptake data are interpreted via our present knowledge of this system.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 2 , February 1991 , pp. 227 - 231
Copyright
Copyright © Materials Research Society 1991

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Footnotes

a)

Presented at the Materials Research Society Meeting, Boston, Massachusetts, in November, 1988.

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