Time-dependent amorphization of ice at 0.8-0.9 GPa.
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.
Department of Experimental Physics, Umea University, S-901 87, Umea, Sweden.
Ove
O
Andersson
G P
GP
Johari