Study on the mechanisms of Grain boundary diffusion of polar ice

利用人造冰进行了晶界生长实验，得到晶界迁移的激活能为110。120kJ·mol~(-1)~(-1)，是冰自扩散的两倍。研制了一种最小测量时间为10min、不确定度小于10-10 S-1的冰蠕变应变率测量系统。将感兴趣的冰样放置在冷室中，其设定点温度和最大稳定度分别为-30到-10℃和±20mK或更低。该系统采用改进型相位调制零差干涉仪，以超低热膨胀玻璃为支撑材料，实现了纳米级及以下分辨率的冰形变测量。

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.