Abstract
The isothermal annealing behavior of the Pb-doped BPSCCO 2223 superconductor in ambient oxygen at various temperatures (650 to 800°C) is studied systematically by in-situ resistivity measurement, thermogravimetrical analysis (TGA), transmission electron microscope observation (TEM), X-ray diffraction analysis (XRD), and electron probe micro analysis (EPMA). It is found that upon annealing under oxidizing conditions a Ca2PbO4-like phase is formed, the sample weight and resistivity increase, and the modulated structure is changed from Pb-type to Bi-type gradually. Based on these experimental results, a two-dimensinal diffusion model of Pb2+ in Bi2O2 planes is proposed, and the activation energy for Pb2+ diffusion is determined to be 1.47 eV.
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