Effect of Irradiation on the Superconductor Properties ofBi2 Sr2-x Lix Ca2 Cu3Oy

 
 

M.A.Hapeep

Babylon University, College of Education, Department of Physics

 

Abstract
High temperature superconductor Bi2 Sr2-xLixCa2Cu3Oy was prepared by a solid state reaction method, with firing temperature 800 oC for 24 hours and sintering temperature 850 oC for 140 hours.Superconductor properties studied before and after irradiation, critical temperature and oxygen content increases by increasing of ratio of Li (Li=0.1,0.2,0.3), but its decrease after irradiation.
 
X-ray diffraction analysis showed that the compounds have two phases: high-Tcphase (2223) and low-Tc phase(2212) in addition to impurity phase, also irradiation lead to decreases volume fraction of high-Tc phase(2223) and appear new peaks.
 
Scanning electron microscope has been used to evidence the morphology of the superconductor phases. Grain size increases by increasing of Li concentration and these grains take square-shaped, but after irradiation grain size becomessmaller and square -shaped disappear.