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Mechanical and superconducting properties of BiPbSrCaCuO-PE and BiPbSrCaCuO-MgO composites

Els Bruneel (UGent) , F Persyn and Serge Hoste (UGent)
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Abstract
In this work it is shown that the inherently weak mechanical properties of monolithic high-temperature superconductors can be improved by processing the superconductor into a composite. Both polyethylene (PE) and MgO were used to prepare a composite material with BiPbSrCaCuO (BSCCO) superconductors. Three-point bending tests were conducted on monolithic BSCCO, 50 vol% BSCCO-PE and 50 vol% BSCCO-MgO particulate composites. As expected, the PE composites exhibited an increased ductility in comparison with the monolithic material and a decreased flexural modulus, while the flexural strength remains comparable with that of monolithic BSCCO. Although the presence of a resistive percolation path could be demonstrated at and below room temperature, zero resistivity at T < T-c was not observed and the magnetic expulsion force diminished after processing. Magnetic measurements show that this is due to poor intergrain coupling. In contrast to the PE composites, the BSCCO-MgO composites can be re-sintered after mixing. This provides an opportunity for the material to regain the intergrain couplings and results in the recovery of zero resistivity at 110 K and in magnetic expulsion due to intergrain currents. Mechanical measurement on the MgO composites showed a decrease in ductility, an increased flexural modulus and a comparable flexural strength.
Keywords
POLYMER COMPOSITES, CU-O SUPERCONDUCTOR, TEMPERATURE, PHASE

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Chicago
Bruneel, Els, F Persyn, and Serge Hoste. 1998. “Mechanical and Superconducting Properties of BiPbSrCaCuO-PE and BiPbSrCaCuO-MgO Composites.” Superconductor Science & Technology 11 (1): 88–93.
APA
Bruneel, Els, Persyn, F., & Hoste, S. (1998). Mechanical and superconducting properties of BiPbSrCaCuO-PE and BiPbSrCaCuO-MgO composites. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 11(1), 88–93. Presented at the 3rd European conference on Applied Superconductivity (EUCAS  ’97) ; Satellite conference on Superconducting Materials Aspects - Research and Technology (SMART '97).
Vancouver
1.
Bruneel E, Persyn F, Hoste S. Mechanical and superconducting properties of BiPbSrCaCuO-PE and BiPbSrCaCuO-MgO composites. SUPERCONDUCTOR SCIENCE & TECHNOLOGY. 1998;11(1):88–93.
MLA
Bruneel, Els, F Persyn, and Serge Hoste. “Mechanical and Superconducting Properties of BiPbSrCaCuO-PE and BiPbSrCaCuO-MgO Composites.” SUPERCONDUCTOR SCIENCE & TECHNOLOGY 11.1 (1998): 88–93. Print.
@article{176573,
  abstract     = {In this work it is shown that the inherently weak mechanical properties of monolithic high-temperature superconductors can be improved by processing the superconductor into a composite. Both polyethylene (PE) and MgO were used to prepare a composite material with BiPbSrCaCuO (BSCCO) superconductors. Three-point bending tests were conducted on monolithic BSCCO, 50 vol\% BSCCO-PE and 50 vol\% BSCCO-MgO particulate composites. As expected, the PE composites exhibited an increased ductility in comparison with the monolithic material and a decreased flexural modulus, while the flexural strength remains comparable with that of monolithic BSCCO. Although the presence of a resistive percolation path could be demonstrated at and below room temperature, zero resistivity at T {\textlangle} T-c was not observed and the magnetic expulsion force diminished after processing. Magnetic measurements show that this is due to poor intergrain coupling. In contrast to the PE composites, the BSCCO-MgO composites can be re-sintered after mixing. This provides an opportunity for the material to regain the intergrain couplings and results in the recovery of zero resistivity at 110 K and in magnetic expulsion due to intergrain currents. Mechanical measurement on the MgO composites showed a decrease in ductility, an increased flexural modulus and a comparable flexural strength.},
  author       = {Bruneel, Els and Persyn, F and Hoste, Serge},
  issn         = {0953-2048},
  journal      = {SUPERCONDUCTOR SCIENCE \& TECHNOLOGY},
  keyword      = {POLYMER COMPOSITES,CU-O SUPERCONDUCTOR,TEMPERATURE,PHASE},
  language     = {eng},
  location     = {Li{\`e}ge, Belgium},
  number       = {1},
  pages        = {88--93},
  title        = {Mechanical and superconducting properties of BiPbSrCaCuO-PE and BiPbSrCaCuO-MgO composites},
  url          = {http://dx.doi.org/10.1088/0953-2048/11/1/018},
  volume       = {11},
  year         = {1998},
}

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