Grain boundary degradation of YBCO superconductors sintered in CO{sub 2}-containing atmospheres
- Argonne National Lab., IL (United States)
- New Mexico Inst. of Mining and Metallurgy, Socorro, NM (United States). Dept. of Materials and Metallurgical Engineering
- San Jose State Univ., CA (United States). Dept. of Materials Engineering
The transport critical current density (J{sub c}) of YBCO superconductors decreased with increasing CO{sub 2} partial pressure in the sintering atmosphere and ultimately reached zero, even though magnetization measurements showed that the bulk of the samples with zero J{sub c} remained superconducting. The microstructure and composition of the samples was investigated by high resolution transmission electron microscopy and secondary-ion mass spectroscopy (SIMS). Microbeam SIMS indicated carbon segregation at grain boundaries (GBs). Approximately 10% of the GBs were coated with a thin layer of a second phase, deduced to be BaCuO{sub 2} and BaCu{sub 2}O{sub 2}. Near some grain boundaries, the structure was tetragonal within several tens of nm of the boundaries. The degradation of J{sub c} is discussed in terms of the partial pressure of CO{sub 2} and the processing temperatures. Detailed examination of GB microstructures is given in this paper.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10194903
- Report Number(s):
- ANL/ET/CP--78725; CONF-931142--4; ON: DE94003206; CNN: Contract DMR88-09854
- Country of Publication:
- United States
- Language:
- English
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