Fig. 2: Unit-cell dimensions and structural parameters of (MV)BiBr5 under pressure. | Nature Communications

Fig. 2: Unit-cell dimensions and structural parameters of (MV)BiBr5 under pressure.

From: Pressure-induced shape and color changes and mechanical-stimulation-driven reverse transition in a one-dimensional hybrid halide

Fig. 2

a Lattice parameters as a function of pressure. The third-order Birch-Murnaghan equations of states (EOS) fit to the formula-unit volume (V/Z) data of phase γ and γ‘. The inset shows the unit-cells before and after phase transition viewed along different directions. b The pressure dependence of the Bi-Br-Bi’ bending angle between the BiBr6 octahedra in three phases. c Changes of Bi-Br bond lengths as a function of pressure. d, e Evolution of average quadratic elongation (〈λ〉), and average bond angle variance (σθ2) under compression. Note that the error bars were obtained from the SXRD experiments and the phase transitions at 0.20 and 3.25 GPa are indicated as red dashed lines.

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