NORMAL AND SUPERCONDUCTING STATE PROPERTIES OF Y1BAXCU3OY COMPOUNDS

The effect of barium concentration on the structure and the normal and superconducting state properties of Y1BaxCu3Oy compounds has been stu died for 1.3 less-than-or-equal-to x less-than-or-equal-to 2.4. XRD pa tterns reveal that superconductivity in all the compounds investigated is due to the presence of YBa2Cu3O7-delta phase. As expected, single Y1Ba2Cu3O7-delta phase was obtained only for x = 2.0. For x not-equal 2.0, additional compounds (impurity phases) like Y2BaCuO5, BaCuO2, BaC O3 and CuO were observed. It has been found that the presence of these impurity phases has a large effect on the normal state properties lik e the resistivity, Hall coefficient and Hall mobility. The superconduc ting parameters like onset transition temperature, T(co), transition w idth, DELTA T, and final transition temperature, T(cf), are also affec ted but only to a comparatively small extent.