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The temperature dependence of hypersonic longitudinal and transverse sound waves in ``strong'' (B₂{O}₃$) and ``fragile'' [${Ca}0.4K0.6(NO₃{)}₄$] glass-forming systems have been probed using Brillouin scattering. In the latter material the transverse modes become masked by a central component in the spectrum which broadens as the temperature is raised through the liquidus temperature; in B₂{O}₃$, on the other hand, well-defined (undamped) transverse modes are observed above the melting temperature of crystalline ${B}₂O₃ ({~}723 K) all the way to 1300 K.
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Grimsditch et al. (1989) studied this question.
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