Abstract
As an important functional material, Bi2O3 is found in seven polymorphs. We systematically analyze the transformation from α-, β- and ∊- to δ-Bi2O3 by using crystallographic group theory and structural simulations. A transition phase is proved to exist in the transformation from the α-, β- and ∊-Bi2O3 to δ-Bi2O3. The transition phase is supposed to be tetragonal phase Bi2O2.7 (Z = 2) with the 139th 
space group.
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