Time-dependent amorphization of ice at 0.8–0.9 GPa
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Thermal conductivity measurements show that ice continues to amorphize for several days when kept at a fixed pressure p in the 0.79-0.88 GPa range, and fixed temperature T in the 127-130 K range. Thermal conductivity kappa decreases according to a stretched exponential in time, and its limiting long time value kappa( infinity ) varies with p and T. At 0.8 GPa and 128 K, kappa( infinity ) remains 2.5 times the value observed for high-density amorph. Consequences of these findings for our understanding of amorphization are discussed.
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