The temperature dependence of the nonergodicity parameter fq in the ``fragile'' glass-former propylene carbonate has been investigated using a wide-frequency-window Brillouin-scattering technique. A critical decrease of fq is revealed at temperatures well above the calorimetric glass transition in accordance with mode-coupling theories for the liquid-glass transition. The determined critical temperature (270±{}5 K) is, however, significantly higher than that obtained using incoherent neutron scattering (210±{}15 K); this does not agree with the universal Tc in the mode-coupling theory.
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Elmroth et al. (1992) studied this question.
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