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The mechanisms for pressure-induced amorphization of ice I(h).

Author(s) : TSE J. S., KLUG D. D., TULK C. A., et al.

Type of article: Article

Summary

The high-density amorphous (HDA) phase of ice I(h) forms at a pressure close to the extrapolated melting curve of ice, leading to the suggestion that it may have structure similar to that of dense water. On annealing, HDA ice transforms into a low-density amorphous (LDA) phase with a distinct phase boundary. The authors use quasi-harmonic lattice-dynamics calculations to show that the amorphization mechanism in ice I(h) changes from thermodynamic melting for T> 162 K to mechanical melting at lower temperatures. The vibrational spectra of ice I(h), LDA ice and quenched water also indicate a structure for LDA ice that differs from that of the liquid.

Details

  • Original title: The mechanisms for pressure-induced amorphization of ice I(h).
  • Record ID : 2000-2384
  • Languages: English
  • Source: Nature - vol. 400 - n. 6745
  • Publication date: 1999/08/12
  • Document available for consultation in the library of the IIR headquarters only.

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