| Resistivity－temperature characteristics of sol gel YBa2Cu3Oy samples synthesized in flowing oxygen atmosphere |
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| 引用本文： | 周增均,周卓为,周良玉,林莉,李星国,冯庆荣. Resistivity－temperature characteristics of sol gel YBa2Cu3Oy samples synthesized in flowing oxygen atmosphere[J]. 中国物理, 2004, 13(11): 1957-1961 |
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| 作者姓名： | 周增均 周卓为 周良玉 林莉 李星国 冯庆荣 |
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| 作者单位： | School of Physics and State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China;School of Physics and State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China;School of Physics and State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China;Department of Chemistry, Peking University, Beijing 100871, China;Department of Chemistry, Peking University, Beijing 100871, China;School of Physics and State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China |
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| 基金项目： | Project supported by China National Centre for Research and Development of Superconductivity (Grant No BKBRSF G1999064602). |
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| 摘 要： | The relationship of resistivity versus synthesizing temperature of sol gel YBa_2Cu_3O_y samples was studied when prepared under flowing oxygen conditions. A set of high-temperature ρ－T curves was obtained for the whole process. After the sample finished the test measuring, its resistivity was ρ_{300}=9.83×10^{-3 }Ω·cm at room temperature. The ρ－T curve also showed that the orthorhombic－tetragonal phase transformation of sol-gel YBa_2Cu_3O_y sample occurred at 581℃ for the sample in the rising temperature process, but at 613℃ in the cooling process, lower than that of the samples made by using the conventional powder metallurgy methods.
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| 关 键 词： | sol gel YBa_2Cu_3O_y sample ρ－T curve resistivity phase transformation |
| 收稿时间： | 2004-04-27 |
Resistivity－temperature characteristics of sol gel YBa2Cu3Oy samples synthesized in flowing oxygen atmosphere |
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| Zhou Zeng-Jun,Zhou Zuo-Wei,Zhou Liang-Yu,Lin Li,Li Xing-Guo and Feng Qing-Rong. Resistivity－temperature characteristics of sol gel YBa2Cu3Oy samples synthesized in flowing oxygen atmosphere[J]. Chinese Physics, 2004, 13(11): 1957-1961 |
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| Authors: | Zhou Zeng-Jun Zhou Zuo-Wei Zhou Liang-Yu Lin Li Li Xing-Guo Feng Qing-Rong |
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| Affiliation: | Department of Chemistry, Peking University, Beijing 100871, China; School of Physics and State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China |
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| Abstract: | The relationship of resistivity versus synthesizing temperature of sol gel YBa_2Cu_3O_y samples was studied when prepared under flowing oxygen conditions. A set of high-temperature ρ－T curves was obtained for the whole process. After the sample finished the test measuring, its resistivity was ρ_{300}=9.83×10^{-3 }Ω·cm at room temperature. The ρ－T curve also showed that the orthorhombic－tetragonal phase transformation of sol-gel YBa_2Cu_3O_y sample occurred at 581℃ for the sample in the rising temperature process, but at 613℃ in the cooling process, lower than that of the samples made by using the conventional powder metallurgy methods. |
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| Keywords: | sol gel YBa_2Cu_3O_y sample ρ－T curve resistivity phase transformation |
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