| Title |
A Study on the Magnetic Properties of Ceramics Superconductors for Simpllified Testing System |
| DOI |
https://doi.org/10.5370/KIEE.2012.61.2.339 |
| Keywords |
YBCO ; Precursor ; Pyrolysis ; TiO_2 |
| Abstract |
The high Tc superconductor of YBCO system with the nominal composition of precursor was prepared from mixed powders of Y_2O_3, BaCO_3, CuO and TiO_2 by the thermal pyrolysis method. The effect of TiO_2 doping to Y based ceramics superconductors fabricated by the thermal pyrolysis reaction, to investigate the effect of the dopant on the superconductivity. The voltage appearing across the field-cooled HTS sample increased with external magnetic field. The improvement of critical current property as well as the mechanical property is important for the application. The improvement of the critical current can be achieved by forming the nano size defect working as a flux pining center inside the superconductor. We simply added TiO_2 to starting materials to dope TiO_2 and observed an increase in the trapped field and the critical current density up to at least 5 wt % TiO_2. The TiO_2 was converted to fine BaTiO_3 particles which were trapped in YBCO matrix during the sintering process. We observed a peak effect of Jc that can be attributed to TiO_2 doping and results suggest that introducing a proper amount of pinning centers can significantly enhance current density. |