Ice XII in its second regime of metastability

Koza,Schober,Hansen,Tolle,Fujara

Published 2000 in Physical Review Letters

ABSTRACT

We present neutron powder diffraction results which give unambiguous evidence for the formation of the recently identified new crystalline ice phase [2], labeled ice XII, in completely different conditions. Ice XII is produced here by compressing hexagonal ice I(h) at T = 77, 100, 140, and 160 K up to 1.8 GPa. It can be maintained at ambient pressure in the temperature range 1.5<T<135 K. Accurate structural properties are obtained from high-resolution diffraction carried out at T = 1.5 K. At T = 140 and 160 K additionally ice III/IX is formed. The increasing amount of ice III/IX with increasing temperature gives an upper limit of T approximately 150 K for the successful formation of ice XII with the presented procedure.

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