Fig. 10. (a) Stacked powder X-ray diffractograms of UiO-66(Hf) samples showing appearance of the reo phase in formic acid modulated syntheses (top) compared to calculated patterns for the fcu, reo, and nano-reo (nano domains of reo within fcu) phases. (b) Image of the non-defective, 12-connected fcu net of UiO-66(Hf). (c) Image of missing cluster defects leading to the formation of reo nanodomains in UiO-66(Hf). Reprinted (adapted) with permission from ref. 64. Copyright (2014) Springer Nature.