On the mechanism of solid-state phase transitions in molecular crystals – the role of cooperative motion in (quasi)racemic linear amino acids

Smets, M. M. H.; Kalkman, E.; Krieger, A.; Tinnemans, P.; Meekes, H.; Vlieg, E.; Cuppen, H. M.

doi:10.1107/S2052252520001335

Figure 8
Thermal stage polarisation microscopy snapshots showing an example of a fast phase transition in some of the layers of a crystal; (top) the α → β phase transition of DL-Nle during cooling and (bottom) the β → α phase transition of DL-Nle during heating. The transforming layers are indicated by the arrows. Reprinted with permission from Smets et al. (2015