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Luminescence from Defects and Impurity Centers in Y2O3

Published online by Cambridge University Press:  28 February 2011

M. S. Jahan ,
D. W. Cooke ,
B. L Bennett ,
W. L Hults ,
M. A. Maez ,
K. C. Ott  and
J. L. Smith
M. S. Jahan
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
D. W. Cooke
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
B. L Bennett
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
W. L Hults
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
M. A. Maez
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
K. C. Ott
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
J. L. Smith
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

High-purity (99.999%) Y2O3 powder is used as a starting material for fabricating high-temperature superconductors (HTS), and is frequently found as an unreacted second phase in the final product. We have found that as-received Y2O3 contains Tb3+ paramagnetic impurity ions as determined by TSL and emission-spectra measurements. Deep luminescence traps (presumably Tb4+ ions) are formed in Y2O3 when it is exposed to frays, x rays, or fluorescent lights. These deep traps can only be removed by annealing the material to near 1600°C. Given the short coherence length of HTS it is possible that order-of-magnitude variations in the Tb impurity concentration of starting materials may affect the ultimate value of surface resistance (Rs).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 417
Copyright
Copyright © Materials Research Society 1990

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References

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