中国物理B ›› 2004, Vol. 13 ›› Issue (11): 1957-1961.doi: 10.1088/1009-1963/13/11/035

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Resistivity－temperature characteristics of sol gel YBa2Cu3Oy samples synthesized in flowing oxygen atmosphere

林莉1, 李星国1, 周增均2, 周卓为2, 周良玉2, 冯庆荣2   

  1. (1)Department of Chemistry, Peking University, Beijing 100871, China; (2)School of Physics and State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China
  • 收稿日期:2004-04-27 修回日期:2004-06-24 出版日期:2004-11-20 发布日期:2005-06-20
  • 基金资助:
    Project supported by China National Centre for Research and Development of Superconductivity (Grant No BKBRSF G1999064602).

Resistivity－temperature characteristics of sol gel YBa2Cu3Oy samples synthesized in flowing oxygen atmosphere

Zhou Zeng-Jun (周增均)a, Zhou Zuo-Wei (周卓为)a, Zhou Liang-Yu (周良玉)a, Lin Li (林莉)b, Li Xing-Guo (李星国)b, Feng Qing-Rong (冯庆荣)a   

  1. a School of Physics and State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China; b Department of Chemistry, Peking University, Beijing 100871, China
  • Received:2004-04-27 Revised:2004-06-24 Online:2004-11-20 Published:2005-06-20
  • Supported by:
    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.

关键词: sol gel YBa_2Cu_3O_y sample, ρ－T curve, resistivity, phase transformation

Abstract: The relationship of resistivity versus synthesizing temperature of sol gel YBa$_2$Cu$_3$O$_y$ samples was studied when prepared under flowing oxygen conditions. A set of high-temperature $\rho－T$ curves was obtained for the whole process. After the sample finished the test measuring, its resistivity was $\rho_{300}=9.83\times10^{-3 }\Omega\cdot$cm at room temperature. The $\rho－T$ curve also showed that the orthorhombic－tetragonal phase transformation of sol-gel YBa$_2$Cu$_3$O$_y$ 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.

Key words: sol gel YBa$_2$Cu$_3$O$_y$ sample, $\rho－T$ curve, resistivity, phase transformation

中图分类号: 

  • 74.72.Bk
74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition)