Abstract
In situ high-pressure/low-temperature synchrotron x-ray diffraction and optical Raman spectroscopy were used to examine the structural properties, equation of state, and vibrational dynamics of ice VIII. The x-ray measurements show that the pressure-volume relations remain smooth up to 23 GPa at 80 K. Although there is no evidence for structural changes to at least 14 GPa, the unit-cell axial ratio c∕a undergoes changes at 10–14 GPa. Raman measurements carried out at 80 K show that the νTzA1g+νTx,yEg lattice modes for the Raman spectra of ice VIII in the lower-frequency regions (50–800cm−1) disappear at around 10 GPa, and then a new peak of ∼150cm−1 appears at 14 GPa. The combined data provide evidence for a transition beginning near 10 GPa. The results are consistent with recent synchrotron far-IR measurements and theoretical calculations. The decompressed phase recovered at ambient pressure transforms to low-density amorphous ice when heated to ∼125K.
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Dates
Type | When |
---|---|
Created | 19 years, 7 months ago (Jan. 5, 2006, 6:04 p.m.) |
Deposited | 2 years, 1 month ago (June 30, 2023, 4:17 p.m.) |
Indexed | 3 weeks, 1 day ago (July 30, 2025, 6:45 a.m.) |
Issued | 19 years, 7 months ago (Jan. 9, 2006) |
Published | 19 years, 7 months ago (Jan. 9, 2006) |
Published Online | 19 years, 7 months ago (Jan. 9, 2006) |
Published Print | 19 years, 7 months ago (Jan. 14, 2006) |
@article{Yoshimura_2006, title={High-pressure x-ray diffraction and Raman spectroscopy of ice VIII}, volume={124}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.2140277}, DOI={10.1063/1.2140277}, number={2}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Yoshimura, Yukihiro and Stewart, Sarah T. and Somayazulu, Maddury and Mao, Ho-kwang and Hemley, Russell J.}, year={2006}, month=jan }