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Glass and glass-ceramic materials containing photoactive and magnetic crystalline phases were prepared from Fe 2 O 3 and Bi 2 O 3 using the conventional melt method. All samples were characterized in terms of formed phases, morphological analyses, optical properties, and magnetic properties. Formation of the photoactive tetragonal β- and body-centered cubic γ-Bi 2 O 3 phases along with the magnetic BiFeO 3 and Fe 3 O 4 phases was revealed. However, the crystalline structure relied on the composition and the applied heat-treatment time. β-/γ-Bi 2 O 3 transformation could be controlled by the heat-treatment time. The samples exhibited variable magnetic properties depending on their composition. All of the samples showed excellent absorbance in visible light with an optical band gap of 1.90-2.22 eV, making them ideal for solar-light-driven photocatalysis. The best performance was recorded for the sample containing equal amounts of Fe 2 O 3 and Bi 2 O 3 due to the formation of γ-Bi 2 O 3 /BiFeO 3 heterojunction in this sample.

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Bi2O3–BiFeO3 Glass-Ceramic: Controllable β-/γ-Bi2O3 Transformation and Application as Magnetic Solar-Driven Photocatalyst for Water Decontamination