Temperature dependence of ‘‘pure’’ ice grain boundary mobility

NASELLO, OLGA BEATRIZ; DI PRINZIO, CARLOS LEONARDO

ACTA MATERIALIA

Año: 2005 vol. 53 p. 4863 - 4869

1359-6454

Pure ice bicrystals with crystalline misorientation h1010i=60 and different configurations were prepared using Milli Q water(impurities less than 102 ppm) and annealed at 5, 10, 15 and 20 C for 170 days. The grain boundary migration was analyzedusing a theory developed for the migration of a grain boundary interacting with the sample surface. For each temperature, twosamples were measured and grain boundary mobilities were determined. It is observed that the obtained values are widely dispersed,but their maximums can be accurately fitted by an Arrhenius law with an activation energy of 0.53 eV. The experimental values ofgrain boundary mobility obtained are compared with the theory. It is shown that, for the study temperatures, grain boundaries in‘‘pure’’ ice do not behave as a liquid-like structure. 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.Keywords: Ice; Grain boundaries; Grain boundary migration; Aging; Grain boundary diffusion