Chemistry of H2O and HF Under Extreme Conditions

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The predicted high pressure superionic phases of water and HF are investigated via ab initio molecular dynamics. These phases could potentially be achieved through either static compression with heating or through shock compression. We study water at densities of 2.0-3.0 g/cc (34-115 GPa) along the 2000K isotherm.We find that extremely rapid (superionic) diffusion of protons occurs in a fluid phase at pressures between 34 and 58 GPa. A transition to a stable body-centered cubic (bcc) O lattice with superionic proton conductivity is observed between 70 and 75 GPa, a much higher pressure than suggested in prior work. We find that ... continued below

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10 p. (0.2 MB)

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Fried, L.; Goldman, N.; Kuo, I. W. & Mundy, C. November 28, 2005.

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The predicted high pressure superionic phases of water and HF are investigated via ab initio molecular dynamics. These phases could potentially be achieved through either static compression with heating or through shock compression. We study water at densities of 2.0-3.0 g/cc (34-115 GPa) along the 2000K isotherm.We find that extremely rapid (superionic) diffusion of protons occurs in a fluid phase at pressures between 34 and 58 GPa. A transition to a stable body-centered cubic (bcc) O lattice with superionic proton conductivity is observed between 70 and 75 GPa, a much higher pressure than suggested in prior work. We find that all molecular species at pressures greater than 75 GPa are too short lived to be classified as bound states. Up to 95 GPa, we find a solid superionic phase characterized by covalent O-H bonding. Above 95 GPa, a transient network phase is found characterized by symmetric O-H hydrogen bonding with nearly 50% covalent character. Ab initio molecular dynamics simulations of HF were conducted at densities of 1.8-4.0 g/cc along the 900 K isotherm. According to our simulations, a unique form of (symmetric) hydrogen bonding could play a significant role in superionic conduction. Our work shows that superionic phases could be more prevalent in hydrogen bonded systems than previously thought, such as HCl and HBr.

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10 p. (0.2 MB)

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PDF-file: 10 pages; size: 0.2 Mbytes

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  • Presented at: APS Shock Compression of Condensed Matter, Baltimore, MD, United States, Jul 31 - Aug 05, 2005

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  • Report No.: UCRL-CONF-217385
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 889983
  • Archival Resource Key: ark:/67531/metadc884760

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  • November 28, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • April 13, 2017, 3:04 p.m.

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Fried, L.; Goldman, N.; Kuo, I. W. & Mundy, C. Chemistry of H2O and HF Under Extreme Conditions, article, November 28, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc884760/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.