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Characterization results of micro-Bi-180s, micro-Bi-300s, and micro-Bi-1800s. Topological SEM images of (a) micro-Bi-180s, (b) micro-Bi-300s, and (c) micro-Bi-1800s and cross-sectional SEM images of (d) micro-Bi-180s, (e) micro-Bi-300s, and (f) micro-Bi-1800s. (g) XRD patterns of micro-Bi-180s, micro-Bi-300s, and micro-Bi-1800s.
