Effect of irradiation on the properties of Bi2 Sr2-x Lix Ca2 Cu3Oy superconductor

الملخص EN

High temperature superconductor Bi2 Sr2-xLix Ca2Cu3Oy 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 were studied before and after irradiation, critical temperature and oxygen content increase by increasing the ratio of Li (Li = 0.1, 0.2, 0.3), but they decrease after irradiation.

X-ray diffraction analysis showed that the compounds have two phases: high-Tc phase (2223) and low-Tc phase (2212) in addition to impurity phase, also irradiation leads to a decrease of volume fraction of high-Tc phase (2223) and the appearance of new peaks.

Scanning electron microscope has been used to investigate the morphology of the superconductor phases.

Grain size increases by increasing of Li concentration and these grains take a square-shape, but after irradiation grain size becomes smaller and the square -shape disappears.