J Mater Sci Technol ›› 1989, Vol. 5 ›› Issue (3): 164-169.

• Articles • Previous Articles     Next Articles

Temperature Dependence of phase Transitions and Superconductivity in YBa_2Cu_3O_(7-X)

ZHANG Yansheng TIAN Xing LU Xing LI Xiaoli TENG Yingli PANG Xu Dalian Railway Institute,Dalian,China.   

  • Received:1989-05-28 Revised:1989-05-28 Online:1989-05-28 Published:2009-10-10

Abstract: By means of X-ray diffraction investigations and electric resistivity measurements the tempera- ture dependence of phase structure and supercon- ductivity in YBa_2Cu_3O_(7_x) over the temperature range of 20℃-950℃ have been studied.The lattice parameters a,b and c as well as conductivity as a function of annealing temperatures can be roughly divided into three zones which are superconductive orthorhombic structure 1(a

Key words: superconductivity of YBa_2Cu_3O_(7-x)phase transformation, heat treatment