Grain boundary degradation of YBCO superconductors sintered in CO{sub 2}-containing atmospheres
Abstract
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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- OSTI Identifier:
- 10194903
- Report Number(s):
- ANL/ET/CP-78725; CONF-931142-4
ON: DE94003206; CNN: Contract DMR88-09854; TRN: 94:000788
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Technical Report
- Resource Relation:
- Conference: 1. meeting of the Pacific Rim ceramic societies,Honolulu, HI (United States),7-10 Nov 1993; Other Information: PBD: Nov 1993
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; YTTRIUM OXIDES; CRITICAL CURRENT; MICROSTRUCTURE; BARIUM OXIDES; COPPER OXIDES; HIGH-TC SUPERCONDUCTORS; CURRENT DENSITY; PRESSURE DEPENDENCE; CARBON DIOXIDE; SUPERCONDUCTIVITY; TRANSMISSION ELECTRON MICROSCOPY; SEGREGATION; GRAIN BOUNDARIES; EXPERIMENTAL DATA; SINTERING; 360207; 360202
Citation Formats
Balachandran, U, Merkle, K L, Mundy, J N, Gao, Y, Zhang, C, Xu, D, and Selvaduray, G. Grain boundary degradation of YBCO superconductors sintered in CO{sub 2}-containing atmospheres. United States: N. p., 1993.
Web. doi:10.2172/10194903.
Balachandran, U, Merkle, K L, Mundy, J N, Gao, Y, Zhang, C, Xu, D, & Selvaduray, G. Grain boundary degradation of YBCO superconductors sintered in CO{sub 2}-containing atmospheres. United States. https://doi.org/10.2172/10194903
Balachandran, U, Merkle, K L, Mundy, J N, Gao, Y, Zhang, C, Xu, D, and Selvaduray, G. 1993.
"Grain boundary degradation of YBCO superconductors sintered in CO{sub 2}-containing atmospheres". United States. https://doi.org/10.2172/10194903. https://www.osti.gov/servlets/purl/10194903.
@article{osti_10194903,
title = {Grain boundary degradation of YBCO superconductors sintered in CO{sub 2}-containing atmospheres},
author = {Balachandran, U and Merkle, K L and Mundy, J N and Gao, Y and Zhang, C and Xu, D and Selvaduray, G},
abstractNote = {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.},
doi = {10.2172/10194903},
url = {https://www.osti.gov/biblio/10194903},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Nov 01 00:00:00 EST 1993},
month = {Mon Nov 01 00:00:00 EST 1993}
}