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Figure 3
Compressibility along the c axis (c/c0) of brucite and DHMS phase E. (a) c/c0 of brucite reported by Nagai et al., 2000BB9 (circles); Okuchi et al., 2014BB15 (triangles); and Parise et al., 1994BB16 (squares). The solid and broken lines are linear fits of these data points at lower and higher pressures, respectively. The inset numbers show the distance D⋯O across the interlayer space at room temperature, obtained from Okuchi et al. (2014BB15), and Parise et al. (1994BB16). The distance monotonically decreases with increasing pressure to form a hydrogen bonding interlayer, which makes the structure distinctly harder. The inset figures show the D sites of brucite at ambient and high pressures, respectively. (b) c/c0 of DHMS phase E reported by Shieh et al., 2000BB22 (diamonds). The c axis of DHMS phase E around ambient pressure is already less compressible than that of brucite at high pressures. The inset number shows the distance D⋯O, determined in present study. The inset figure shows the D sites of DHMS phase E.

IUCrJ
Volume 7| Part 3| May 2020| Pages 370-374
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520003036