The effects of composition, synthesis conditions, oxygen content and F doping on superconductivity and structure for R-substituted Bi-2201

The effects of composition, synthesis conditions, oxygen content and F doping on superconductivity and structure for the R-substituted Bi-2201 compound was investigated by means of XRD and measurements of superconductivity. For the compound (R = La, Pr, Nd and Sm), the optimum value of x for is x = 0.4. When x = 0.4, the optimum sintering temperature is for R = La, Pr and Nd, for R = Sm. decreases with decreasing ionic radius of R. For , the optimum range of oxygen content is y = 0.28 - 0.33 and the superconductivity is improved by quenching. For F-doped Bi-2201, decreases with increasing F content.