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Figure 2
Pressure dependence of the unit-cell parameters and components β and γ of the modulation vector q = βb* + γc*. (a) The a and b parameters are sensitive to pressure, while c is rather stable, c = 4.61 ± 0.02 Å. (b) The unit-cell volume ratio relative to the phase at ambient temperature and normal pressure. (c) The β component of the vector q changes from 0.06 ± 0.002 to 0.115 ± 0.010 between 17.4 (1) and 18.5 (1) GPa. (d) The γ component is stable, with a value equal to 1.36 ± 0.005.

IUCrJ
Volume 4| Part 2| March 2017| Pages 152-157
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517000264