ja511153n_si_005.cif (14.82 kB)
Mechanism of H2O Insertion and Chemical Bond Formation in AlPO4‑54·xH2O at High Pressure
dataset
posted on 2015-01-21, 00:00 authored by Frederico
G. Alabarse, Jérôme Rouquette, Benoît Coasne, Abel Haidoux, Carsten Paulmann, Olivier Cambon, Julien HainesThe
insertion of H2O in AlPO4-54·xH2O at high pressure was investigated by single-crystal
X-ray diffraction and Monte Carlo molecular simulation. H2O molecules are concentrated, in particular, near the pore walls.
Upon insertion, the additional water is highly disordered. Insertion
of H2O (superhydration) is found to impede pore collapse
in the material, thereby strongly modifying its mechanical behavior.
However, instead of stabilizing the structure with respect to amorphization,
the results provide evidence for the early stages of chemical bond
formation between H2O molecules and tetrahedrally coordinated
aluminum, which is at the origin of the amorphization/reaction process.