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Information × Registration Number 0208U002052, 0105U002083 , R & D reports Title Development of the theory of striction and piezooptical effects in ferroactive materials of order-disorder type, including those with hydrogen bonds popup.stage_title Head Levitskii Roman Romanovych, Registration Date 15-01-2008 Organization Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine popup.description2 Microscopic theories of the physical properties of Rochelle salt and KH2PO4 family ferroelectrics have been developed for the first time. Influence of longitudinal electric field and hydrostatic pressure on the physical characteristics of these crystals has been explored. Pseudospin models with competing interactions have been studied. A model for proton glass with essential short-range and long-range interactions has been proposed for the first time. Large attention was paid to investigation of the effects of localized magnons in magnetic materials with frustrated spin-spin interactions. A model for lattice dynamics in monoclinic crystals of the CsH2PO4 і RbD2PO4 type has been proposed. Thermodynamic and dielectric characteristics of the CsH2PO4 ferroelectrics have been studied. A molecular theory of nematics in presence of surfaces and external fields has been proposed. Behavior of colloids in nematics has been explored. Product Description popup.authors popup.nrat_date 2020-04-02 Close