Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 7 August 1998:
Vol. 281. no. 5378, pp. 809 - 812
DOI: 10.1126/science.281.5378.809
Prev | Table of Contents | Next

Reports

In Situ Observations of a High-Pressure Phase of H2O Ice

I-Ming Chou, * Jennifer G. Blank, dagger Alexander F. Goncharov, Ho-kwang Mao, Russell J. Hemley

A previously unknown solid phase of H2O has been identified by its peculiar growth patterns, distinct pressure-temperature melting relations, and vibrational Raman spectra. Morphologies of ice crystals and their pressure-temperature melting relations were directly observed in a hydrothermal diamond-anvil cell for H2O bulk densities between 1203 and 1257 kilograms per cubic meter at temperatures between -10° and 50°C. Under these conditions, four different ice forms were observed to melt: two stable phases, ice V and ice VI, and two metastable phases, ice IV and the new ice phase. The Raman spectra and crystal morphology are consistent with a disordered anisotropic structure with some similarities to ice VI.

I. Chou, 955 National Center, U.S. Geological Survey, Reston, VA 20192, USA. J. G. Blank, A. F. Goncharov, H. Mao, R. J. Hemley, Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015, USA.
*   To whom correspondence should be addressed.

dagger    Present address: Department of Geology and Geophysics, University of California, Berkeley, CA 94720, USA.

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
X-ray-induced dissociation of H2O and formation of an O2-H2 alloy at high pressure..
W. L. Mao, H.-k. Mao, Y. Meng, P. J. Eng, M. Y. Hu, P. Chow, Y. Q. Cai, J. Shu, and R. J. Hemley (2006)
Science 314, 636-638
   Abstract »    Full Text »    PDF »
From the Cover: Hydrogen storage in molecular compounds.
W. L. Mao and H.-k. Mao (2004)
PNAS 101, 708-710
   Abstract »    Full Text »    PDF »
High pressure-temperature aqueous systems in the hydrothermal diamond anvil cell (HDAC).
W. A. BASSETT (2003)
European Journal of Mineralogy 15, 773-780
   Abstract »    Full Text »    PDF »
New windows on earth and planetary interiors.
R. J. Hemley and H. K. Mao (2002)
Mineralogical Magazine 66, 791-811
   Abstract »    Full Text »    PDF »
Hydrogen Clusters in Clathrate Hydrate.
W. L. Mao, H.-k. Mao, A. F. Goncharov, V. V. Struzhkin, Q. Guo, J. Hu, J. Shu, R. J. Hemley, M. Somayazulu, and Y. Zhao (2002)
Science 297, 2247-2249
   Abstract »    Full Text »    PDF »
Transformations in methane hydrates.
I-M. Chou, A. Sharma, R. C. Burruss, J. Shu, H.-k. Mao, R. J. Hemley, A. F. Goncharov, L. A. Stern, and S. H. Kirby (2000)
PNAS
   Abstract »    Full Text »
Fossilized high pressure from the Earth's deep interior: The coesite-in-diamond barometer.
N. V. Sobolev, B. A. Fursenko, S. V. Goryainov, J. Shu, R. J. Hemley, H.-k. Mao, and F. R. Boyd (2000)
PNAS
   Abstract »    Full Text »
Fossilized high pressure from the Earth's deep interior: The coesite-in-diamond barometer.
N. V. Sobolev, B. A. Fursenko, S. V. Goryainov, J. Shu, R. J. Hemley, H.-k. Mao, and F. R. Boyd (2000)
PNAS 97, 11875-11879
   Abstract »    Full Text »    PDF »
Transformations in methane hydrates.
I-M. Chou, A. Sharma, R. C. Burruss, J. Shu, H.-k. Mao, R. J. Hemley, A. F. Goncharov, L. A. Stern, and S. H. Kirby (2000)
PNAS 97, 13484-13487
   Abstract »    Full Text »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)