“…Bismuth oxide has high dielectric permittivity, good refractive index, photoconductivity, and photoluminescence [15]. Thus, it has potential uses in a variety of fields, including solid-state fuel cells [16], photovoltaic cells [17], high-temperature superconductors [18], photocatalysts [19], gas sensors [20], optical coatings [21], and biomedical applications [22]. The five crystallographic polymorphs of Bi 2 O 3 are α-Bi 2 O 3 (monoclinic), β-Bi 2 O 3 (tetragonal), γ-Bi 2 O 3 (body-centered cubic), δ-Bi 2 O 3 (cubic), and ε-Bi 2 O 3 (triclinic).…”