Carbon retention in YBa2Cu3O7–δ and its effect on the superconducting transition
- 1 June 1990
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 5 (6) , 1176-1184
- https://doi.org/10.1557/jmr.1990.1176
Abstract
Magnetic susceptibility measurements are used to show that the superconducting transition temperature of yttrium barium cuprate is lowered by carbon trapped in the microstructure of dense polycrystalline materials during sintering. We show that carbon is retained in the material as a result of the porosity closing off during the sintering process. X-ray photoelectron spectroscopy and electron energy loss spectroscopy are used to show that the retained carbon forms a solid solution with YBa2Cu3O7–δ and resides in a barium carbonate-like configuration in the crystal structure. The origin of the lowering of the superconducting transition temperature and processing strategies for preventing carbon retention are discussed.Keywords
This publication has 8 references indexed in Scilit:
- Issues in the Processing of Cuprate Ceramic SuperconductorsJournal of the American Ceramic Society, 1989
- Some effects of CO2, CO and H2O upon the properties of Ba2YCu3O7Materials Research Bulletin, 1988
- Bulk and thick films of the superconducting phase YBa2Cu3O7−y made by controlled precipitation and sol-gel processesJournal of Applied Physics, 1988
- The effect of density on critical current and oxygen stoichiometry of YBa2Cu3Ox superconductorsNature, 1988
- On the defect structure of grain boundaries in Ba2YCu3O7–xJournal of Crystal Growth, 1987
- Correlation of with hole concentration in superconductorsPhysical Review B, 1987
- Photoemission on the highT c superconductors Y?Ba?Cu?OZeitschrift für Physik B Condensed Matter, 1987
- High-energy resolution electron spectrometer for 1-nm spatial analysisReview of Scientific Instruments, 1986