1. Tunable excitation x-ray-fluorescence spectroscopy in phase-analysis of high-Tc superconductors
- Author
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Butorin, S.M, Guo, J.H., Wassdahl, N, Bray, G, Glans, Peter, Wiell, T, Duda, L.C., Nordgren, J, Lundström, T, Klauda, M, Markl, J, Fink, C, Saemannischenko, G, Butorin, S.M, Guo, J.H., Wassdahl, N, Bray, G, Glans, Peter, Wiell, T, Duda, L.C., Nordgren, J, Lundström, T, Klauda, M, Markl, J, Fink, C, and Saemannischenko, G
- Abstract
O Kalpha x-ray fluorescence of YBa2Cu3O7-delta and Sr0.85Nd0.15CuO2 samples containing CO3(2-) impurities, as well as pure BaCO3, have been studied using tunable monochromatic synchrotron radiation excitation. When the excitation energy is set to the most intense features in the O 1s absorption edge of cuprates and to bound states above this edge the O Kalpha spectra recorded are very similar to those of pure BaCO3 even if the admixture of CO3(2-) is small. The observed changes in the O Kalpha profiles of multi-phase YBa2Cu3O7-delta and Sr0.85Nd0.15CuO2 samples are discussed in terms of different x-ray absorption cross sections for O in the main phase and in the CO3(2-) fraction.
- Published
- 1994