Formation of amorphous ice by careful annealing of ice XII
Abstract
Thermally induced transformations of ice XII were characterized using the Raman spectra of the isolated O-D vibration of 5% HDO molecules in H2O ice XII. Spectra were collected continuously as samples were annealed between 77-160 K. Raman spectra first show a sharp peak centered on Δν=2424 cm-1 from ice XII at 120 K. As the sample is further annealed isothermally at 120 K this peak broadens and shifts to higher frequency Δν=2439 cm-1 and full width at half maximum 65 cm-1, indicating the production of low-density amorphous ice by decompression amorphization. Ice Ic is formed upon further annealing at 130-140 K. The local hydrogen bond strength of the resulting amorphous phase was found to be close to that of glassy water.
- Publication:
-
Physical Review B
- Pub Date:
- June 2001
- DOI:
- 10.1103/PhysRevB.63.212201
- Bibcode:
- 2001PhRvB..63u2201T
- Keywords:
-
- 61.43.Er;
- 64.70.Kb;
- 78.30.Hv;
- Other amorphous solids;
- Solid-solid transitions;
- Other nonmetallic inorganics