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采用偏光显微镜观察了67Pb(Mg1/3Nb2/3)O3-33PbTiO3固溶体铁电单晶在室温时90铁电畴结构.铁电畴结构与晶体质量有关,在正交偏光显微镜下光学透明晶体中存在着尺寸为23mm的均匀大畴,不同极化方向的大畴重叠形成雾状区,使晶体表现出光学质量宏观不均匀.在光学质量差的雾状晶体中则存在着0.1mm宽的110型带状孪生畴,使晶体形成表面浮凸,带状畴内还存在着90°亚畴.并对这些畴的形成作了讨论

90 Ferroelectric domains in 67 Pb(Mg1/3Nb2/3) O3-33PbTiO3 single crystal were observed at room temperature by using crossed polarized light microscope(PLM). Ferroelectric domain structures depend on the quality of single crystals. Large homogeneous domains of 23mm exist in optical transparent single crystals. Large domains with different polarization orientation overlap to form opaque regions. 110 type 90 banded a-a domain with 90 sub-domain can be observed in translucent crystals. The dimension of banded twin is about 0.1mm. As a result, surface relief appears on translucent crystal surface. The mechanism of forming these domains was discussed.

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