Abstract
KDP ferroelectrics are isomorphic crystals of potassium, rubidium, cesium dihydrogen phosphates and arsenates: KH2PO4, RbH2PO4, CsH2PO4,KH2AsO4, RbH2AsO4, CsH2AsO4 and their deuterated (partially or fully) analogs. The substitution of protium by deuterium leaves the regularities of their physical properties unaffected. The study of KDP-crystals is of obvious interest. These crystals are widely used in laser technology. Their physical properties are described in [1–5], where a thermodynamical theory of ferroelectrics of various structures is also discussed. The results of the statistical theory of KDP-crystals are discussed on the basis of molecular-kinetic representations which account for and substantiate their physical properties. It is found that the phase transition from a para- to a ferrophase is the transition of the ordering type [1–5] since the crystals undergo dipole and deformation ordering. An early statistical theory of dipole ordering was developed for crystals possessing cubic structures [9] of the perovskite BaTiO3 (or Fe3AIC) type and those of the ReO3 (or Cu3N) type [6–8].
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