Pastes were prepared the same way as for the SAOS measurements and filled in the sample holder immediately after mixing. The pastes were covered with a 7.5 µm thick polyimide film to prevent water evaporation during the measurements. Starting at 10 min after mixing, a diffractogram was collected every 15 min (7 -50 • 2θ). The in-situ XRD measurements were carried out for a total duration of 3 h.