ENHANCED MICROSTRUCTURAL HOMOGENEITY AND COMPOSITIONAL DISTRIBUTION OF BI₂SR₂CACU₂O₈+Δ SUPERCONDUCTING CERAMICS ANALYZED BY CHEMICAL IMAGING
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In this study, Bi₂Sr₂CaCu₂O₈+δ (Bi-2212) superconducting ceramics were synthesized by the conventional solid-state method and analyzed using advanced chemical imaging techniques. The microstructural morphology and spatial distribution of chemical components were investigated in three-dimensional mapping mode. The results revealed a pronounced depth variation ranging from 2.5 µm to 9.1 µm, demonstrating compositional heterogeneity within the polycrystalline matrix. The color-encoded imaging clearly distinguished Bi-rich and Cu-rich regions, suggesting localized phase segregation influenced by oxygen diffusion and cooling dynamics. A multi-stage thermal treatment was found to enhance microstructural compactness and reduce phase inhomogeneity. The correlation between chemical imaging data and microstructural uniformity provides new insight into optimizing processing conditions for improved superconducting properties in Bi-based ceramics.
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