Study on the mechanisms of Grain boundary diffusion of polar ice

点击翻译按钮获取中文摘要

Grain growth experiments performed using artificial ice and it was found that the activation energy for the grain boundary migration was 110. 120 kJ mol^<-1>, which is twice that for the self-diffusion of ice. An ice creep strain rate measurement system with an uncertainty of order less than 10-10 s-1 and a minimum measurement time of 10 min is developed. The ice specimen of interest is set in a cold cell, with a set-point temperature and maximum stability of-30 to-10℃and±20 mK or less, respectively. A modified phase modulation homodyne interferometer, the supporting material of which is ultralow-thermal-expansion glass, is combined with the system to measure the ice deformation with the resolution of nanometer scale or less.