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

作　　者：V.Ya.Shur V.A.Shikhova P.S.Zelenovskiy D.V.Pelegov L.I.Ivleva J.Dec 

机构地区：[1]Ferroelectric Laboratory,Institute of Natural Sciences Ural Federal University,51 Lenin Ave.Ekaterinburg 620000,Russia [2]General Physics Institute of the Russian Academy of Sciences 38 Vavilov Str.,Moscow 119991,Russia [3]Institute of Materials Science,University of Silesia,4 Uniwersytecka Str.,Katowice PL-40-007,Poland

出　　处：《Journal of Advanced Dielectrics》2014年第1期87-94,共8页先进电介质学报（英文）

摘　　要：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 patterns.The static domain images have been obtained by optical microscopy and piezoresponse force microscopy.The Raman confocal microscopy allowed us to obtain the domain images in the bulk.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 symmetry.Switching 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. 

分 类 号：TG1[金属学及工艺—金属学]