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Formation of self-assembled nanodomain structures in single crystals of uniaxial ferroelectrics lithium niobate, lithium tantalate and strontium–barium niobate

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Journal of Advanced Dielectrics 2014年第1期4卷 87-94页

作者： V.Ya.Shur V.A.Shikhova P.S.Zelenovskiy D.V.Pelegov L.I.Ivleva J.Dec Ferroelectric Laboratory Institute of Natural Sciences Ural Federal University51 Lenin Ave.Ekaterinburg 620000Russia General Physics Institute of the Russian Academy of Sciences 38 Vavilov Str. Moscow 119991Russia Institute of Materials Science University of Silesia4 Uniwersytecka Str.Katowice PL-40-007Poland

The formation and evolution of the self-assembled nanodomain structures during polarization reversal have been comparatively analyzed in single crystals of various uniaxial ferroelectrics:LiNbO_(3)(LN),LiTaO_(3)(LT)and Sr_(x)Ba_(1-x)Nb_(2)O_(6)(SBN).Several experimental methods have been used for visualization of the micro-and nanodomain *** static domain images have been obtained by optical microscopy and piezoresponse force *** Raman confocal microscopy allowed us to obtain the domain images in the *** equilibrium slow switching with effective screening resulted in growth of polygon-shaped microdomains:hexagons in LN,triangles in LT and squares in SBN,which corresponds to crystal *** in nonequilibrium conditions(noneffective screening of depolarization field)brings to appearance of similar nanodomain structures in all studied crystals as a result of different processes:(1)formation of nanodomain ensembles,(2)discrete switching,(3)incomplete merging and(4)spontaneous backswitching.

关键词： nanodomain structures self-assembling lithium niobate lithium tantalate strontium-barium niobate.

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Self-assembled domain structures:From micro-to nanoscale

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Journal of Advanced Dielectrics 2015年第2期5卷 72-83页

作者： Vladimir Shur Andrey Akhmatkhanov Alexey Lobov Anton Turygin Ferroelectric Laboratory Institute of Natural Sciences Ural Federal University51 Lenin Ave Ekaterinburg 620000Russia

The recent achievements in studying the self-assembled evolution of micro-and nanoscale domain structures in uniaxial single crystalline ferroelectrics lithium niobate and lithium tantalate have been *** results obtained by visualization of static domain patterns and kinetics of the domain structure by different methods from common optical microscopy to more sophisticated scanning probe microscopy,scanning electron microscopy and confocal Raman microscopy,have been *** kinetic approach based on various nucleation processes similar to the first-order phase transition was used for explanation of the domain structure evolution *** main mechanisms of self-assembling for nonequilibrium switching conditions caused by screening ineffectiveness including correlated nucleation,domain growth anisotropy,and domain–domain interaction have been *** formation of variety of self-assembled domain patterns such as fractal-type,finger and web structures,broad domain boundaries,and dendrites have been revealed at each of all five stages of domain structure evolution during polarization *** possible applications of self-assembling for micro-and nanodomain engineering were reviewed *** review covers mostly the results published by our research group.

关键词： Self-assembling nanodomain structures nanodomain engineering lithium niobate lithium tantalate.

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