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

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Science  07 Aug 1998:
Vol. 281, Issue 5378, pp. 809-812
DOI: 10.1126/science.281.5378.809

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Abstract

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.

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

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