Effect of excess Er203 addition on the levitation force of ErBa2Cu307 superconductor / Faizatul Lela Jafar
The effect of excess Er203 additioti to superconducting ErBa2Oi307-s is reported. ErBa2Cu307-6 pellets were prepared using conventional solid-state synthesis with final sintering at 930 °C in air for 24 hours. Appropriate amounts of Erz03 (0 to 20 wt. %) was then added to ErBa2Cu3O7.fi foliowed by r...
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2002
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my-uitm-ir.1018392024-09-13T08:08:15Z Effect of excess Er203 addition on the levitation force of ErBa2Cu307 superconductor / Faizatul Lela Jafar 2002 Jafar, Faizatul Lela The effect of excess Er203 additioti to superconducting ErBa2Oi307-s is reported. ErBa2Cu307-6 pellets were prepared using conventional solid-state synthesis with final sintering at 930 °C in air for 24 hours. Appropriate amounts of Erz03 (0 to 20 wt. %) was then added to ErBa2Cu3O7.fi foliowed by regrinding and repelletizing before partial melting for a duration of 30 minutes in flowing oxygen at 1100 °C. The partially melted samples were reground and repelletized before final sintering at 930 °C in air for 24 hours. Resistance versus temperature measurements shows superconductivity only for samples with 0, 10 and 20 wt, % Er2Ü3 with Tc onset between 89-92 K and Tc zero between 71-84 K. Magnetic levitation force (MLF) measurements at 77 K on the samples observed non-linear relation between MLF with the amount of Er2Ü3 addition. At a separation distance of 0.24 cm between magnet and superconductor, MLF for pure sample is 9.9 mN. For the same separation distance, MLF initially drops to 1.8 mN for 5 wt. % Er203 and then increases back gradually from 4.9 mN for 10 wt. % Er203 to a maximum of 21.2 mN for 20 wt. % Er203. X-ray powder diffraction analyses showed formation of Er2BaCuO^ (Er211) phase, which may act as flux pinning centers in the Er203-added samples. The experimental results were also discussed in relation to weight-loss analysis of the samples. 2002 Thesis https://ir.uitm.edu.my/id/eprint/101839/ https://ir.uitm.edu.my/id/eprint/101839/1/101839.pdf text en public degree Universiti Teknologi MARA (UiTM) Faculty of Applied Science |
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The effect of excess Er203 additioti to superconducting ErBa2Oi307-s is reported. ErBa2Cu307-6 pellets were prepared using conventional solid-state synthesis with final sintering at 930 °C in air for 24 hours. Appropriate amounts of Erz03 (0 to 20 wt. %) was then added to ErBa2Cu3O7.fi foliowed by regrinding and repelletizing before partial melting for a duration of 30 minutes in flowing oxygen at 1100 °C. The partially melted samples were reground and repelletized before final sintering at 930 °C in air for 24 hours. Resistance versus temperature measurements shows superconductivity only for samples with 0, 10 and 20 wt, % Er2Ü3 with Tc onset between 89-92 K and Tc zero between 71-84 K. Magnetic levitation force (MLF) measurements at 77 K on the samples observed non-linear relation between MLF with the amount of Er2Ü3 addition. At a separation distance of 0.24 cm between magnet and superconductor, MLF for pure sample is 9.9 mN. For the same separation distance, MLF initially drops to 1.8 mN for 5 wt. % Er203 and then increases back gradually from 4.9 mN for 10 wt. % Er203 to a maximum of 21.2 mN for 20 wt. % Er203. X-ray powder diffraction analyses showed formation of Er2BaCuO^ (Er211) phase, which may act as flux pinning centers in the Er203-added samples. The experimental results were also discussed in relation to weight-loss analysis of the samples. |
| format |
Thesis |
| qualification_level |
Bachelor degree |
| author |
Jafar, Faizatul Lela |
| spellingShingle |
Jafar, Faizatul Lela Effect of excess Er203 addition on the levitation force of ErBa2Cu307 superconductor / Faizatul Lela Jafar |
| author_facet |
Jafar, Faizatul Lela |
| author_sort |
Jafar, Faizatul Lela |
| title |
Effect of excess Er203 addition on the levitation force of ErBa2Cu307 superconductor / Faizatul Lela Jafar |
| title_short |
Effect of excess Er203 addition on the levitation force of ErBa2Cu307 superconductor / Faizatul Lela Jafar |
| title_full |
Effect of excess Er203 addition on the levitation force of ErBa2Cu307 superconductor / Faizatul Lela Jafar |
| title_fullStr |
Effect of excess Er203 addition on the levitation force of ErBa2Cu307 superconductor / Faizatul Lela Jafar |
| title_full_unstemmed |
Effect of excess Er203 addition on the levitation force of ErBa2Cu307 superconductor / Faizatul Lela Jafar |
| title_sort |
effect of excess er203 addition on the levitation force of erba2cu307 superconductor / faizatul lela jafar |
| granting_institution |
Universiti Teknologi MARA (UiTM) |
| granting_department |
Faculty of Applied Science |
| publishDate |
2002 |
| url |
https://ir.uitm.edu.my/id/eprint/101839/1/101839.pdf |
| _version_ |
1811769190421364736 |