CAJ | 학술논문

利用多种方法观察了弛豫型铁电单晶PMNT中电畴结构随组分与结构的演变过程与特征.观察发现，在PMN-PT的三方相区内，随PT含量的增加，电畴结构表现出微畴--(亚微畴)--不规则宏畴--规则宏畴转变历程；在三方--四方相变中，非180°电畴发生71°(或109°)宏畴--90°宏畴的转化，同时电畴图像变得更为规则.根据不同组分PMNT电畴的显示特征，提出晶体的最大双折射率可以作为度量其弛豫性强弱的光学参数.观察到了电畴的分布不均匀与多级结构现象，前者与组分或结构的起伏有关，后者与多期式马氏体转变有关.本文还分析了偏光显微镜、DIC、SEM、SEAM等观察方法中电畴的成像特征.
이용다충방법관찰료이예형철전단정PMNT중전주결구수조분여결구적연변과정여특정.관찰발현，재PMN-PT적삼방상구내，수PT함량적증가，전주결구표현출미주--(아미주)--불규칙굉주--규칙굉주전변역정；재삼방--사방상변중，비180°전주발생71°(혹109°)굉주--90°굉주적전화，동시전주도상변득경위규칙.근거불동조분PMNT전주적현시특정，제출정체적최대쌍절사솔가이작위도량기이예성강약적광학삼수.관찰도료전주적분포불균균여다급결구현상，전자여조분혹결구적기복유관，후자여다기식마씨체전변유관.본문환분석료편광현미경、DIC、SEM、SEAM등관찰방법중전주적성상특정.
This paper studied the evolution progress and feature of domain configuration while the composition and structure changed in relaxor ferroelectric single crystals Pb(Mg1/3Nb2/3)O3-PbTiO3. It was found that with increasing PbTiO3 concentration in the rhombohedral phase region of PMN-PT system, domain configuration exhibited a transition process, i.e. microdomains-(sub-microdomains)-irregular macrodomains-regular macrodomains. And then, if PbTiO3 increased further, rhombohedral-tetragonal phase transition could take place, giving rise to the change from 71(or 109) domains to 90 ones. 90 domains demonstrated more regular or typical configuration than 71(or 109) domains. In light of the showing feature of domain configuration, it was proposed that the largest birefractive index of PMNT crystals could be taken as an optical parameter measuring their relaxor degree in ferroelectric behavior. Moreover, the phenomena of non-uniform distribution of domain structures within a plate were observed, which arose from composition heterogeneity and structure fluctuation. Domains with substructure were also visualized, which could be interpreted by multistage martensitic transformation. In addition, the paper discussed the imaging features of domain configuration under the observation means including polarizing microscopes, differential interference contrast microscopes (DIC), scanning electronic microscopes (SEM) and scanning electronic acoustic microscopes (SEAM).