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Chinese Physics, 2004, Vol. 13(11): 1957-1961    DOI: 10.1088/1009-1963/13/11/035
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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
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
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.
Keywords:  sol gel YBa$_2$Cu$_3$O$_y$ sample      $\rho-T$ curve      resistivity      phase transformation  
Received:  27 April 2004      Revised:  24 June 2004      Accepted manuscript online: 
PACS:  74.72.Bk  
  74.25.Fy  
  74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition)  
Fund: Project supported by China National Centre for Research and Development of Superconductivity (Grant No BKBRSF G1999064602).

Cite this article: 

Zhou Zeng-Jun (周增均), Zhou Zuo-Wei (周卓为), Zhou Liang-Yu (周良玉), Lin Li (林莉), Li Xing-Guo (李星国), Feng Qing-Rong (冯庆荣) Resistivity-temperature characteristics of sol gel YBa2Cu3Oy samples synthesized in flowing oxygen atmosphere 2004 Chinese Physics 13 1957

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