The acoustic branch of two network glasses, (Li₂O)ₓB₂O₃ ( x0ex0ex=0ex0ex0.25 and 0.5), is followed over a large momentum transfer range 1--12nm^-1, using inelastic x-ray scattering. We observe the transition from propagating modes to a region of strong scattering as the Ioffe-Regel limit is reached. A region of Rayleigh scattering of the acoustic modes precedes the strong scattering regime at larger Q, causing a rapid decrease of the mean-free path of the modes.
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Matic et al. (2001) studied this question.
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