Fig. 2. (a) Time-resolved PDFs calculated from in situ total scattering data showing the evolution from the FeWO₄ precursor structure, via an intermediate phase to a product at 160 °C and 100 bar. Dashed lines have been added to highlight the region of the intermediate phase. (b) PDFs and (c) F(Q) from in situ total scattering data of intermediate and product phases present during the MWO₄ (M = Mn, Fe, Co, Ni) syntheses at 160 °C and 100 bar. The grey areas highlight crucial features which are discussed in the text.