As an important functional material,Bi_(2)O_(3)is found in seven polymorphs.We systematically analyze the transformation fromα-,β-andε-toδ-Bi_(2)O_(3)by using crystallographic group theory and structural simulations.A transition phase is proved to exist in the transformation from theα-,β-andε-Bi_(2)O_(3)toδ-Bi2 Os.The transition phase is supposed to be tetragonal phase Bi_(2)O_(2.7)(Z=2)with the 139th I 4/m 2/m 2/m space group.
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机译：Application of cyclic partial phase transformations for identifying kinetic transitions during solid-state phase transformations: Experiments and modeling
机译：High-resolution structural studies of ultra-thin magnetic, transition metal overlayers and two-dimensional transition metal oxides using synchrotron radiation
