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X-ray measurements on single-crystals of Rb_1-x(NH₄)ₓH₂PO₄ trace the development of a glasslike state. The absence of macroscopic crystal-symmetry change during freezing is confirmed, while diffuse scattering reveals the growth of very-short-range order. The latter coincides with a compressibility anomaly seen in Brillouin scattering and with dielectric effects suggesting freezing. The system is in many ways analogous to spin-glasses.
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Courtens et al. (1984) studied this question.
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