Dielectric properties of crystals of R₃Sb₅O₁₂ family (R =Gd, Pr, Nd, Er)

Present article is devoted to study of dielectric properties of crystals of R₃Sb₅O₁₂ family (R =Gd, Pr, Nd, Er). Thus, the dielectric properties of new combinations of R₃Sb₅O₁₂ family (R =Gd, Pr, Nd, Er) under the different temperatures and tensions of electrical field have been researched. Experimental installations have been developed for studying spontaneous polarization and permittivity of dielectrics at various temperatures. It is shown how the crystals under study spontaneously polarize and at what temperature the sample passes from the ferroelectric to the paraelectric state. It was found that when a sample is placed in an electric field, the value of spontaneous polarization increases with increasing value of the electric field strength and gradually saturates. The reasons of increasing of the rate of dielectric permeability to the vicinity of temperature of structural phase transition have been described. (author)