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Figure 7
Variation of the frequency of the of the B2 symmetry-breaking lattice mode as a function of pressure. Frequencies were calculated by periodic DFT; imaginary frequencies are shown as negative numbers.

IUCrJ
Volume 7| Part 1| January 2020| Pages 58-70
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519015616