Microscopic Dynamics of Liquid Aluminum Oxide

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Science  28 Mar 2003:
Vol. 299, Issue 5615, pp. 2047-2049
DOI: 10.1126/science.1080950

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Collective excitations have been observed in liquid aluminum oxide at high temperatures by combining a containerless sample environment with inelastic x-ray scattering. The excitation spectra show a well-defined triplet peak structure at lower wave vectorsQ (1 to 6 nanometers−1) and a single quasi-elastic peak at higher Q. The high-Qspectra are well described by kinetic theory. The low-Qspectra require a frequency-dependent viscosity and provide previously unknown experimental constraints on the behavior of liquids at the interface between atomistic and continuum theory.

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