A modulation wave approach to the order hidden in disorder

Withers, R.

doi:10.1107/S2052252514022556

Figure 7
〈 $[{\overline 1}10]$ 〉 zone-axis EDPs of (a) L3-T₀ (MX-1) and (b) an incommensurate polymorph of SiO₂-tridymite. The equivalent 〈 $[{\overline 1}10]$ 〉 zone-axis EDP of high-temperature SiO₂-tridymite above 250°C, with its characteristic curved diffuse intensity distribution, is superimposed in order to show that the strongest incommensurate satellite reflections in both cases fall on the characteristic diffuse distribution. Indexing in both cases is with respect to the HP P6₃/mmc ideal tridymite parent structure. See Withers et al. (1994