Electromechanical and relaxation dielectric properties of RbHSO4 crystal

The temperature dependence of static and dynamic dielectric permittivity, piezoelectric stresses, elastic constants and heat capacity of ferroelectric RbHSO4 are described based on the four-sublattice pseudo-spin model within the mean field approximation. The pseudo-spins are ascribed to SO4(1f) (f=1,…,4) groups which have the dynamic dipole moment in paraelectric phase and manifest a static distortion in ferroelectric phase. We established a set of adjustable model parameters which made it possible to interpret various experimental data.