Simultaneous Thermogravimetry and Evolved-Gas Analysis of YBa2Cu3O7 and LaBa2Cu3O7 Superconductors |
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Authors: | Takahiro Wada Hisao Yamauchi Shoji Tanaka |
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Affiliation: | Superconductivity Research Laboratory, International Superconductivity Technology Center, Tokyo 135 Japan |
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Abstract: | Concurrent thermogravimetry (TG) and evolved-gas analysis (EGA) were done for YBa2Cu3O7-z and LaBa2Cu3-O7-z superconductors. The sample weights were monitored by thermobalance and the evolved O2 and CO2 species were monitored by quadruple mass spectrometer (QMS). No diffraction peak for the impurity phase containing a carbonate group was observed in the X-ray diffraction patterns for these samples, but the release of CO2 was detected by EGA. CO2 gas began to evolve from YBa2Cu3O7-z at 543°C and from LaBa2Cu3O7-z at 692°C. Preparation of high-quality YBa2Cu3O7-z and LaBa2Cu3O7-z superconductors is discussed on the basis of results of these thermal analyses. |
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Keywords: | superconductor yttrium barium copper oxide (YBCO) lanthanum thermal analysis preparation |
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