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Breakdown of intermediate-range order in liquid GeSe2 at high pressure

Nature volume 414, pages 622–625 (2001)Cite this article

Abstract

Studies of liquids with tetrahedral coordination, particularly during compression or quenching, have indicated the existence of distinct phases1,2,3 in the liquid state, distinguishable by density and local structure. In systems that exhibit critical phenomena in the supercooled state, anomalous behaviour of the compressibility is also anticipated above the critical point, as revealed by simulations of water4. Liquid GeSe2 is a potentially attractive system for studying both types of phenomena, given its two-dimensional tetrahedral structure and anomalous physical properties (including a density minimum near its melting point). Here we report in situ X-ray diffraction measurements of solid and liquid GeSe2 at high temperature and high pressure, revealing that the structure of the liquid is sensitive to pressure and that anomalous compressibility is expected. During compression of liquid GeSe2, the connectivity of the liquid changes from two- to three-dimensional, leading to a breakdown of the intermediate-range order. The gradual change in structure above the melting line may develop to a first-order liquid–liquid transition in the supercooled regime.

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Figure 1: The T–P phase diagram of GeSe2 up to 6 GPa.
Figure 2: S(Q) data for liquid GeSe2.
Figure 3: G(r) curves derived for the S(Q) relations shown in Fig. 2.

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Acknowledgements

W.A.C. thanks G. Monaco for discussions throughout the project. We thank P.S. Salmon for providing us with neutron-scattering data on liquid GeSe2 for comparative purposes.

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Authors and Affiliations

  1. European Synchrotron Radiation Facility, BP 220, Grenoble, F-38043, France

    Wilson A. Crichton & Mohamed Mezouar

  2. Department of Chemistry, Norwegian University of Science and Technology, Trondheim, N-7034, Norway

    Tor Grande

  3. Department of Chemistry, University of Oslo, Postbox 1033 Blindern, Oslo, N-0315, Norway

    Svein Stølen

  4. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, Stuttgart, D-70569, Germany

    Andrzej Grzechnik

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  1. Wilson A. Crichton
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Correspondence to Wilson A. Crichton.

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Crichton, W., Mezouar, M., Grande, T. et al. Breakdown of intermediate-range order in liquid GeSe2 at high pressure. Nature 414, 622–625 (2001). https://doi.org/10.1038/414622a

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