Impulsive stimulated light scattering experiments were carried out on an ionic glass former Ca0.4K0.6(NO3)1.4 to determine the temperature dependence of the Debye–Waller factor fq(T) in the q→0 limit and to investigate the structural relaxation dynamics. A square-root cusp anomaly was observed in fq→0(T) at a crossover temperature Tc of 378 K. This and the relaxation dynamics observed were consistent with predictions of the mode-coupling theory of the liquid–glass transition.
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Yang et al. (1996) studied this question.
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