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篇目详细内容 |
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【篇名】 |
Studies of synthesizing behaviors and superconductivity of sol-gel YBa2Cu3O7-x samples in flowing oxygen atmosphere |
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【刊名】 |
Frontiers of Physics in China |
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【刊名缩写】 |
Front. Phys. China |
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【ISSN】 |
1673-3487 |
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【EISSN】 |
1673-3606 |
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【DOI】 |
10.1007/s11467-008-0009-z |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2008 |
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【卷期】 |
3
卷1期 |
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【页码】 |
55-60
页,共
6
页 |
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【作者】 |
LUO Ting;
ZHANG Yi;
LI Xing-guo;
LIN Li;
ZHANG Yue-yang;
FENG Qing-rong;
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【关键词】 |
sol-gel YBa2Cu3Oy sample; high temperature ρ-T curve; phase transformation |
【摘要】 |
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Systematic studies of synthesizing behaviors of sol-gel YBa2Cu3O7-x samples in flowing oxygen atmosphere and their superconductivity have been performed. A set of high temperature ρ-T curves has been obtained for the whole synthesizing process. After four rounds of synthesizing, the resistivity of the sample was around ρ = 1.00 × 10-3 Ωcm at room temperature. The ρ-T curve of the fourth round shows that the orthorhombic to tetragonal phase transformation of the sample occurs around 600°C, which is lower than that of the YBa2Cu3O7-x sample prepared by conventional solid-state reaction method. Other measurements, such as X-ray diffraction, SEM measurement and low temperature R-T and M-T measurement, were also performed. And the R-T and M-T measurement results suggest that during the synthesizing process, there exist some state at which the sample has better superconductivity than the other states. Moreover, we found screw dislocations presenting on the sample broken surface from the SEM images. This will change the concept that the screw dislocations can only grow on the surface of the YBCO thin films and single crystals. |
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