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Figure 2
Pressure dependence of the unit-cell volume per formula unit for polymorphs of BaP up to 27.9 GPa. The experimental data for BaP-I are shown by green solid triangles, for BaP-II by red inversed solid triangles and for BaP-III by blue solid circles. The solid black line shows the fit of all pressure–volume experimental points using the third-order Birch–Murnaghan EoS with the parameters V0 = 311.45 Å3, K0 = 7.7(7) GPa and K′ = 10.10(10). The dashed black line shows the fit of the calculated pressure–volume data points with the parameters V0 = 295.92 Å3, K0 = 11.53(14) GPa and K′ = 8.28(9).

IUCrJ
Volume 12| Part 1| January 2025| Pages 16-22
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524010455