Paraelectric Response of KD2PO4

Abstract

The dielectric behavior of K${\mathrm{D}}_2$P${\mathrm{O}}_4$ in the paraelectric region, i.e., above the Curie temperature, has been measured up to 3.5×${10}^{10}$ cps. For frequencies above the crystal resonances, the complex dielectric coefficient exhibits a relaxation behavior very similar to that observed in triglycine sulfate. A model, which assumes a Gaussian distribution of Debye dipoles, fits the data quite well and appears to establish this representation as a valid one for "soft" ferroelectrics.