An apparently first-order transition between two amorphous phases of ice induced by pressure

The pressure-amorphized state in zirconium tungstate: a precursor to decomposition

“…Theoretical phase diagrams based on total energy calculations [25], not available for ZrW 2 O 8 so far, are also desirable as these would throw further light on the phenomena of pressure-induced amorphization and decomposition in this system. Compounds that undergo irreversible amorphization have often exhibited polyamorphism [26], i.e., the existence of low-and high-density amorphous phases, such as those in quartz [5] and ice [27]. It would be interesting to investigate whether this compound also exhibits polyamorphism.…”

Absence of molecular mobility on nano-second time scales in amorphous ice phases

“…Indeed, bearing in mind that the elastic intensity is coupled to the inelastic response (eqs. 2,3,4,5) there is an inconsistency concerning the behaviour of HDA. Since, among all phases the lowest Debye-level is detected for HDA (Fig.…”

Water Structure from Scattering Experiments and Simulation

“…The neutron diffraction studies performed by Bellissent-Funel and co-workers have attempted to establish two structural limits in liquid water over large ranges in temperature and pressure that correspond closely to the low-density and high-density forms of amorphous ice, LDA and HDA 8,9,75,181,182 . Figure 8 shows a composite g L (r) from LDA and HDA data whose relative weights are fit to an equation of the form…”