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Kimura T, Kuwayama Y, Yagi T. Melting temperatures of H2O up to 72 GPa measured in a diamond anvil cell using CO2 laser heating technique. J Chem Phys. 2014;140(7):074501doi: 10.1063/1.4865252.
Kimura, T., Kuwayama, Y., & Yagi, T. (2014). Melting temperatures of H2O up to 72 GPa measured in a diamond anvil cell using CO2 laser heating technique. The Journal of chemical physics, 140(7), 074501. https://doi.org/10.1063/1.4865252
Kimura, T, et al. "Melting temperatures of H2O up to 72 GPa measured in a diamond anvil cell using CO2 laser heating technique." The Journal of chemical physics vol. 140,7 (2014): 074501. doi: https://doi.org/10.1063/1.4865252
Kimura T, Kuwayama Y, Yagi T. Melting temperatures of H2O up to 72 GPa measured in a diamond anvil cell using CO2 laser heating technique. J Chem Phys. 2014 Feb 21;140(7):074501. doi: 10.1063/1.4865252. PMID: 24559351.
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J Chem Phys. 2014 Feb 21;140(7):074501. doi: 10.1063/1.4865252.

Melting temperatures of H2O up to 72 GPa measured in a diamond anvil cell using CO2 laser heating technique.

The Journal of chemical physics

T Kimura, Y Kuwayama, T Yagi

Affiliations

  1. Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.

PMID: 24559351 DOI: 10.1063/1.4865252

Abstract

The melting curve of H2O from 49 to 72 GPa was determined by using a laser-heated diamond anvil cell. Double-sided CO2 laser heating technique was employed in order to heat the sample directly. Discontinuous changes of the heating efficiency attributed to the H2O melting were observed between 49 and 72 GPa. The obtained melting temperatures at 49 and 72 GPa are 1200 and 1410 K, respectively. We found that the slope of the melting curve significantly decreases with increasing pressure, only 5 K/GPa at 72 GPa while 44 K/GPa at 49 GPa. Our results suggest that the melting curve does not intersect with the isentropes of Uranus and Neptune, and hence, H2O should remain in the liquid state even at the pressure and temperature conditions found deep within Uranus and Neptune.

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