In situ observations of a high-pressure phase of H sub(2)O ice

A previously unknown solid phase of H sub(2)O 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 di...

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Published inScience (American Association for the Advancement of Science) Vol. 281; no. 5378; pp. 809 - 812
Main Authors Chou, I-Ming, Blank, J G, Goncharov, A F, Mao, Ho-Kwang, Hemley, R J
Format Journal Article
LanguageEnglish
Published 07.08.1998
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Summary:A previously unknown solid phase of H sub(2)O 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 H sub(2)O bulk densities between 1203 and 1257 kilograms per cubic meter at temperatures between -10 degree and 50 degree 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.
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ISSN:0036-8075