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In this work, three-dimensional Bi5O7I microstructures were successfully fabricated by a thermal conversion of BiOI microspheres in air at temperatures ranging from 450 to 525°C. The phase structure, morphology, and optical property of the Bi5O7I powders were characterized with respect to that of parent BiOI by XRD, SEM, XPS, TEM, and UV–vis spectroscopy, respectively. The results revealed that porous...
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