Processing and properties of high J{sub c} grain boundaries in melt textured YBa{sub 2}Cu{sub 3}O{sub x}

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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 ... continued below

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8 p.

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Salama, K.; Parikh, A.S.; Kunchur, M.N. & Christen, D.K. November 1, 1994.

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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.

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8 p.

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OSTI as DE96009583

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  • 7. international cryogenic materials conference, Honolulu, HI (United States), 24-26 Oct 1994

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  • Other: DE96009583
  • Report No.: CONF-941067--3
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 224754
  • Archival Resource Key: ark:/67531/metadc672102

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  • November 1, 1994

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  • June 29, 2015, 9:42 p.m.

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  • June 24, 2016, 7:51 p.m.

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Salama, K.; Parikh, A.S.; Kunchur, M.N. & Christen, D.K. Processing and properties of high J{sub c} grain boundaries in melt textured YBa{sub 2}Cu{sub 3}O{sub x}, article, November 1, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc672102/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.