Effect of Na substitution on superconducting properties of Bi-2212 ceramics prepared by Sinter-Forged process
Bulk textured BiSrCaNaCuO (x = 0.0, 0.05, 0.075 0.1, 0.15, and 0.20) ceramics have been prepared by a polymer solution method followed by sinter-forging process. The microstructure and superconducting properties of textured samples were affected by Na substitution. According to XRD data, all samples...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión enviada para evaluación y publicación |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/148676 |
| Acceso en línea: | http://hdl.handle.net/10261/148676 |
| Access Level: | acceso abierto |
| Palabra clave: | Bi-2212 Sodium substitution Texturing Anisotropy Sinter-Forging |
| Sumario: | Bulk textured BiSrCaNaCuO (x = 0.0, 0.05, 0.075 0.1, 0.15, and 0.20) ceramics have been prepared by a polymer solution method followed by sinter-forging process. The microstructure and superconducting properties of textured samples were affected by Na substitution. According to XRD data, all samples show that Bi-2212 phase is the major one, and main peaks corresponded to the (00ℓ) diffractions confirming that the crystallographic c-axis is perpendicular to the surface. SEM micrographs showed that samples are composed of well-stacked and oriented grains. The best critical temperature, T, was measured as 85.6 K for x = 0.075. The critical current density Jc, values decrease gradually with the increase of applied magnetic field. The maximum calculated Jc was 1.38 × 10 A/cm at 10 K for 0.075 Na sample which is about four times higher than the 0.34 × 10 A/cm value determined for the pure sample. The anisotropic properties of these textured materials have been investigated using magnetic measurements. |
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