Parent Bi2CaSr2Cu2O8+δ superconductor was doped with oxygen by annealing powder sample at 500 °C in the flowing oxygen atmosphere with intermittent grinding. The amount of amorphous phase and insulating layer found on the sample surface was increased with more oxygen doping. As a consequence, the sharpness and intensity of the XRD peaks were reduced, and the room temperature conductivity, Tc, as well as the magnetic susceptibility were decreased.
