Pressure-induced polyamorphism in salty water

Pressure-induced polyamorphism in salty water

We investigated the metastable phase diagram of an ionic salt aqueous solution, LiCl:6D₂O, at high pressure and low temperature by neutron diffraction measurements and computer simulations. We show that the presence of salt triggers a stepwise transformation, under annealing at high pressure, to a n...

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Veröffentlicht in:Physical review letters 2011-03, Vol.106 (12), p.125701-125701
Hauptverfasser: Bove, L E, Klotz, S, Philippe, J, Saitta, A M
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Klotz, S
Philippe, J
Saitta, A M
description We investigated the metastable phase diagram of an ionic salt aqueous solution, LiCl:6D₂O, at high pressure and low temperature by neutron diffraction measurements and computer simulations. We show that the presence of salt triggers a stepwise transformation, under annealing at high pressure, to a new very high-density amorphous form. The transition occurs abruptly at 120 K and 2 GPa, is reversible, and is characterized by a sizeable enthalpy release. Simulations suggest that the polyamorphic transition is linked to a local structural reorganization of water molecules around the Li ions.
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title Pressure-induced polyamorphism in salty water
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