Abstract
Parent Bi 2CaSr 2Cu 2O 8+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, T c, as well as the magnetic susceptibility were decreased.
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