Processing and properties of high J{sub c} grain boundaries in melt textured YBa{sub 2}Cu{sub 3}O{sub x}
Conference
·
OSTI ID:224754
Conventional polycrystalline HTS possess extremely low transport critical current density, which has been attributed to grain boundary related deficiencies. We have developed a processing method to eliminate secondary phases and to reduce the amount of microcracks at the grain boundaries in melt-textured YBCO superconductors. In this process, a fraction of the liquid phase is removed during melt-texturing which lead to cleaner grain boundaries. These boundaries have been found to carry high currents (3 {times} 10{sup 4}A/cm{sup 2} at self field and 1.5 {times} 10{sup 2}A/cm{sup 2} at 1.5T) at 77 K in spite of relatively high misorientation angles. Also, the weak dependence of J{sub c} on magnetic field indicates that these grain boundaries are strongly coupled. In addition, the linear I-V characteristics of these samples suggest that flux flow along these boundaries may be the J{sub c} limiting mechanism. These results give promise to manufacturing of polycrstalline YBCO superconductor with high current carrying capability.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- Advanced Research Projects Agency, Washington, DC (United States); Texas State Government, Austin, TX (United States); Houston Univ., TX (United States); USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 224754
- Report Number(s):
- CONF-941067--3; ON: DE96009583
- Country of Publication:
- United States
- Language:
- English
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