SmBa2NbO6 Nanopowders, an Effective Percolation Network Medium for YBCO Superconductors
The percolation behavior of superconductor-insulator composite, YBa2Cu3O7–δ, and nano SmBa2NbO2 synthesized by modified combustion technique was studied. Particle size of nano SmBa2NBO6 was determined using transmission electron microscopy. The chemical nonreactivity of nano SmBa2NbO6 with YBCO is e...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2013/578434 |
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| author | S. Vidya K. C. Mathai P. P. Rejith Sam Solomon J. K. Thomas |
| author_facet | S. Vidya K. C. Mathai P. P. Rejith Sam Solomon J. K. Thomas |
| author_sort | S. Vidya |
| collection | DOAJ |
| description | The percolation behavior of superconductor-insulator composite, YBa2Cu3O7–δ, and nano SmBa2NbO2 synthesized by modified combustion technique was studied. Particle size of nano SmBa2NBO6 was determined using transmission electron microscopy. The chemical nonreactivity of nano SmBa2NbO6 with YBCO is evident from the X-Ray diffraction study which makes it a suitable nanoceramic substrate material for high temperature superconducting films. A systematic increase in the sintered density, approaching the optimum value of the insulating nanophase is clearly observed, as the vol.% of YBCO in the composite decreases. SEM micrograph showed uniform distribution of nanopowder among the large clusters of YBCO. The obtained percolation threshold is ~26 vol% of YBCO in the composite. All the composites below the threshold value showed TC(0)~92 K even though the room resistivity increases with increase in vol.% of nano SmBa2NbO6. The values of critical exponents obtained matches well with the theoretically expected ones for an ideal superconductor-insulator system. |
| format | Article |
| id | doaj-art-20e0962eecb54518a9efda822711ebd0 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-20e0962eecb54518a9efda822711ebd02025-02-03T01:23:27ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422013-01-01201310.1155/2013/578434578434SmBa2NbO6 Nanopowders, an Effective Percolation Network Medium for YBCO SuperconductorsS. Vidya0K. C. Mathai1P. P. Rejith2Sam Solomon3J. K. Thomas4Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College, Thiruvananthapuram, Kerala 695015, IndiaElectronic Materials Research Laboratory, Department of Physics, Mar Ivanios College, Thiruvananthapuram, Kerala 695015, IndiaElectronic Materials Research Laboratory, Department of Physics, Mar Ivanios College, Thiruvananthapuram, Kerala 695015, IndiaDielectric Materials Research Laboratory, Department of Physics, St. John’s College, Kollam District, Anchal, Kerala 691306, IndiaElectronic Materials Research Laboratory, Department of Physics, Mar Ivanios College, Thiruvananthapuram, Kerala 695015, IndiaThe percolation behavior of superconductor-insulator composite, YBa2Cu3O7–δ, and nano SmBa2NbO2 synthesized by modified combustion technique was studied. Particle size of nano SmBa2NBO6 was determined using transmission electron microscopy. The chemical nonreactivity of nano SmBa2NbO6 with YBCO is evident from the X-Ray diffraction study which makes it a suitable nanoceramic substrate material for high temperature superconducting films. A systematic increase in the sintered density, approaching the optimum value of the insulating nanophase is clearly observed, as the vol.% of YBCO in the composite decreases. SEM micrograph showed uniform distribution of nanopowder among the large clusters of YBCO. The obtained percolation threshold is ~26 vol% of YBCO in the composite. All the composites below the threshold value showed TC(0)~92 K even though the room resistivity increases with increase in vol.% of nano SmBa2NbO6. The values of critical exponents obtained matches well with the theoretically expected ones for an ideal superconductor-insulator system.http://dx.doi.org/10.1155/2013/578434 |
| spellingShingle | S. Vidya K. C. Mathai P. P. Rejith Sam Solomon J. K. Thomas SmBa2NbO6 Nanopowders, an Effective Percolation Network Medium for YBCO Superconductors Advances in Materials Science and Engineering |
| title | SmBa2NbO6 Nanopowders, an Effective Percolation Network Medium for YBCO Superconductors |
| title_full | SmBa2NbO6 Nanopowders, an Effective Percolation Network Medium for YBCO Superconductors |
| title_fullStr | SmBa2NbO6 Nanopowders, an Effective Percolation Network Medium for YBCO Superconductors |
| title_full_unstemmed | SmBa2NbO6 Nanopowders, an Effective Percolation Network Medium for YBCO Superconductors |
| title_short | SmBa2NbO6 Nanopowders, an Effective Percolation Network Medium for YBCO Superconductors |
| title_sort | smba2nbo6 nanopowders an effective percolation network medium for ybco superconductors |
| url | http://dx.doi.org/10.1155/2013/578434 |
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