Chemical Structure from Scientific Research

The atomic configurations of a body-centered tetragonal (bct) (red) and B2 (blue) unit cells with respective dimensions of 2.7 x 2.7 x 3.8 A^3 and 3.0 x 3.0 x 3.0 A^3. The bct unit cell is constructed from two disordered fcc unit cells with the dimension of 3.8 x 3.8 x 3.8 A^3 (Supplementary Fig. 6a ). The fcc-to-B2 phase transition occurs via continuous rotation and change in the dimensions of the bct unit.

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