| Relaxor-based ferroelectrics such as Pb(Mg1/3Nb2/3)1-xTixO3(x=0.0～0.40),characterized by interesting ferroelectric, dielectric, piezoelectric, electrostrictive,pyroelectric, electric and nonliner optics properties, related application aboutaerospace, aviation, navigation and weapon in advanced national defense technologyand national economy departments, have became one of the indispensable keymaterials in devices. Pb(Mg1/3Nb2/3)O3(PMN) and PbTiO3（PT）are all relaxorferroelectrics，Pb(Mg1/3Nb2/3)1-xTixO3（PMNT）consist of PMN and PT，andexperiments suggest that PMNT performance is optimal with10%PT. In this paper,using sol-gel method, PMNT thin films with perovskite structure is prepared, themicrostructure, ferroelectric properties, dielectric properties and optical propertiesare analyzed separately. The research content is as follows:1. Instead of Nb(OC2H5)5, we choose cheap Nb2O5to prepare the precursorsand get PMN-0.2PT films with pure-peroveskite phase by sol-gel method. Afteranalyzing and measuring systematically the phase, structure, ferroelectric anddielectric property, a conclusion is made that this method is feasible.2. Based on new source of Nb, PZN-0.2PT films were prepared with sol-gelmethod. Analyzed its optics property in visible spectrum, and fitted the transmissionspectrum using the T-L+Lorentz model. When wavelength more than400nm,PZN-0.2PT films absorption is small and transparency is good. Otherwise whenwavelength lesser than400nm,transparency is bad. In this spectrum, apparently, thefilms absorption increases with the reduction of the wavelength.3. To improve the films performance, discussing the external factors, such assubstrates, electro, temperature/time/atmosphere of the annealing, and internalfactors, such as precursor solution concentration, solvents, chelating agent content,film thickness, PT and niobium content. Study these factors influence on the filmscrystallization, surface morphology, preferred orientation and electric opticalperformance. |
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