High Temperature Superconductors (${\rm Y}_{1-x}{\rm Nd}_{x}$ )Ba2Cu3O7-δ Obtained by Acetate Method
| Autor: | M. B. Fontes, Mylena Pinto Nascimento, A. López, Elisa Baggio-Saitovitch, Ana C. de Leo, Marcelo Azevedo Neves, Ury D. Chacon |
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| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
High-temperature superconductivity Materials science Magnetic moment Scanning electron microscope Analytical chemistry Crystal structure Condensed Matter Physics Magnetic hysteresis Electronic Optical and Magnetic Materials law.invention law Electrical resistivity and conductivity visual_art visual_art.visual_art_medium Ceramic Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 28:1-5 |
| ISSN: | 1558-2515 1051-8223 |
| Popis: | Bulk ceramic samples with chemical composition (Y 1-x Nd x )Ba 2 Cu 3 O 7-δ , where x = 0, 0.1, 0.2, 0.5, and 1 were sintered by a proposed acetate method. The samples were then submitted to structural characterization by X-ray diffraction with crystal structure refining using the Rietveld method. AC electrical resistivity measurements from ambient temperatures down to 4.2 K were performed, as well as magnetic measurements of magnetic moment as function of temperature and magnetic hysteresis loop. Results have shown superconductivity with critical temperatures of about 91 and 60 K for pure YBa 2 Cu 3 O 7-δ (x = 0) and pure NdBa 2 Cu 3 O 7-δ (x = 1) samples, respectively. Scanning electron microscopy images were also analyzed, revealing a regular parallel-piped grain shape. The proposed method showed as an advantage to reduce the grinding time without any considerable degradation on structural or superconducting properties of pure YBa 2 Cu 3 O 7-δ (x = 0) or pure NdBa 2 Cu 3 O 7-δ ( x = 1), as related to samples prepared by a conventional solid state route. |
| Databáze: | OpenAIRE |
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