Pressure dependence of proton glass freezing in Rb1−x (NH4)x H2PO4
Schmidt, V. Hugo
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Studies of the frequency-dependent dielectric properties of a Rb0.52(ND4)0.48D2PO4 (72% deuterated) crystal have shown that the deuteron glass-freezing temperature Tg is suppressed by hydrostatic pressure at a rate of -2.0 K/kbar. This is explained in terms of the influence of pressure on the hydrogen-bond potential. It is suggested that the glassy state should be completely suppressed (i.e., Tg→0 K) at a pressure of less than 10 kbar in undeuterated crystals of similar composition.
G.A. Samara and V.H. Schmidt, "Pressure dependence of proton glass freezing in Rb1-x(NH4)xH2PO4" Phys. Rev. B 34 Rapid Commun. 2035-2037 (1986).