Fig. 4.

Relaxation map of H₂O phases obtained from eHDA. Blue circles, diamonds, and squares refer to dielectric measurements. The numbered green arrows indicate the thermal history of our samples—that is, the temperature program used. The filled symbols were determined directly from peak frequencies, while the crossed symbols were obtained by applying time temperature superposition. The dash-dotted lines correspond to temperatures at which transitions occur; the dotted line marks a time scale of 100 s, which is usually associated with the glass transition temperature. Red triangles correspond to the calorimetric relaxation times τ_cal, calculated using Eq. 1, for heating rates of q = 5, 10, and 30 K/min, which agree excellently with the dielectric time constants.