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Luminescence from Defects and Impurity Centers in Y2O3

  • M. S. Jahan (a1), D. W. Cooke (a1), B. L Bennett (a1), W. L Hults (a1), M. A. Maez (a1), K. C. Ott (a1) and J. L. Smith (a1)...

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).

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