09-08U

We propose a pseudospin model for proton glasses of the Rb$_{1-x}$(NH$_4$)$_x$H$_2$PO$_4$ type, which takes into account the energy levels of protons around the PO$_4$ group, a long-range interactions between the hydrogen bonds, and an internal random deformational field. Within the framework of a four-particle cluster approximation we derive a system of equations for the variational parameters, and also expressions for spontaneous polarization, molar heat capacity, Edwards-Anderson parameter, static longitudinal and transverse dielectric permittivities. Within the Glauber dynamics approach we have studied the temperature behavior of dielectric permittivities of these compounds at different frequencies.