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Environmental effects on luminescence yield of superconducting YBa2Cu3Ox

Published online by Cambridge University Press:  31 January 2011

M. S. Jahan ,
D. W. Cooke ,
H. Sheinberg ,
J. L. Smith  and
D. P. Lianos
M. S. Jahan
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
D. W. Cooke
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
H. Sheinberg
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. L. Smith
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
D. P. Lianos
Affiliation:
W.J. Schafer Associates, Inc., Huntsville, Alabama 35868
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Abstract

Gamma-ray-induced surface defects in YBa2Cu3Ox (x ≈ 7) have been investigated by thermally stimulated luminescence (TSL) following storage of the samples in dry (vacuum), oxygen, and 98% relative humidity environments. Irradiation of samples stored in either vacuum or oxygen environments shows that no insulating chemical species are formed on the surface of the superconductor. In contrast, exposure to the humid environment produces various chemical components on the surface, and, consequently, enhances the TSL yield. Comparison of the YBa2Cu3Ox, TSL glow curve and emission spectra with those of BaCO3 suggests that one of the components contributing to the purported YBa2Cu3Ox luminescence is BaCO3. Evidence for formation of other chemical species and the suitability of the TSL technique for their determination are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 4 , August 1989 , pp. 759 - 762
Copyright
Copyright © Materials Research Society 1989

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References

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