view article
Figure 6
Unit-cell-parameter and β-angle variation of monoclinic SiO2, coesite, with pressure (Angel et al., 2001BB9). Solid lines for a, b and c are the fitted linearized EoSs. Together with the EoS fitted to the unit-cell volume, these allow the pressure evolution of both the unit-cell angle and directions in the unit cell (data points) to be accurately reproduced (solid lines). This includes d(100) which is a principal axis of compression of the structure and softer than any individual cell edge. The dashed line for the β angle is a second-order polynomial fit to the data. The dashed lines for d(100) and [111] calculated from this polynomial and the axial EoS are indistinguishable from values calculated from the axial EoS plus the volume EoS.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 54| Part 6| December 2021| Pages 1621-1630
https://doi.org/10.1107/S1600576721009092
Follow J. Appl. Cryst.
Sign up for e-alerts
E-alerts
Follow J. Appl. Cryst. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS