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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Pure water is a weak electrolyte; only a small amount ionizes into hydrogen and hydroxide ions. At any given temperature, the concentration of undissociated water is almost constant, so the ionic product of water is the product of the hydrogen and hydroxide ion concentrations, denoted as Kw. The square root of Kw gives the individual ion concentrations.
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Crystal Field Theory
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Area of Science:

  • Condensed matter physics
  • High-pressure physics
  • Planetary science

Background:

  • Superionic (SI) water is a key research area, but its melting curve and lattice stability are debated.
  • Experimental data at high pressures are limited due to technical challenges.
  • Understanding SI ice structure is crucial for its peculiar transport properties and planetary interiors.

Purpose of the Study:

  • To investigate the structural phases of water under extreme pressures using ultrafast X-ray diffraction.
  • To resolve discrepancies in existing experimental data on SI ice.
  • To provide new constraints on the stability of SI ice phases.

Main Methods:

  • Ultrafast X-ray diffraction was used to study water compressed by multiple shocks.
  • Pressures up to approximately 180 GPa were achieved.
  • Diffraction patterns were analyzed to determine structural phases.

Main Results:

  • At pressures >150 GPa and temperatures ~2500 K, diffraction patterns contradicted the pure FCC-SI phase model.
  • Experimental evidence supports a mixed close-packed superionic phase at high pressures.
  • Simultaneous BCC and FCC signatures were observed at lower pressures, aligning with some static-compression data.
  • Detailed structural features like stacking faults were identified.

Conclusions:

  • The study provides experimental evidence for mixed close-packed superionic phases in water at extreme conditions.
  • Results help resolve conflicting experimental data regarding SI ice structures.
  • The findings offer new insights into SI ice stability domains and structural complexity.
  • This work advances the understanding of high-pressure SI ice, relevant to giant planet interiors.