Characterization of high-temperature superconductors by electron microprobe analysis |
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Authors: | Theodor H G Hehenkamp |
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Institution: | (1) Institut für Metallphysik, Abteilung Metallkunde, Universität Göttingen, Hospitalstrasse 3-7, D-W-3400 Göttingen, Federal Republic of Germany |
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Abstract: | In order to optimize the physical properties of HTSC small single crystals grown from a melt for basic studies of their physical properties the influence of the environment on their impurity content was investigated by EPMA. This requires quantitative analysis of all elements being present in the crystals. The accuracy of results was affected by problems with the choice and quality of standards, by contamination but also by malfunction of microprobe electronics. The HTSC materials were found to react with mills, milling balls, crucibles and the atmosphere. These problems are being discussed and some reactions being studied for Y1Ba2Cu3O6+x (0 < x < 1) HTSC in A12O3 and ZrO2 crucibles. The crystals grown contain reproducible amounts of impurities depending on boundary conditions and exhibit a zone structure in composition particularly for Y and Ba within their range of homogeneity. |
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Keywords: | High-Tc-Superconductors (HTSC) impurity content transition width standards crucible reactions quantitative EPMA |
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