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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Study on Monoclinic Domain of Morphotropic High Piezoelectric Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 Single Crystals by Transmission Electron Microscopy
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Study on Monoclinic Domain of Morphotropic High Piezoelectric Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 Single Crystals by Transmission Electron Microscopy

机译：透射电子显微镜研究向型高压电Pb（Mg_（1/3）Nb_（2/3））O_3-PbTiO_3单晶的单斜晶域

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0.68Pb(Mg_(1/3)Nb_(2/3))O_3-0.32PbTiO_3 single crystals produced by the modified Bridgman technique were poled along the orientation. We discuss the low-symmetry phase domain in the morphotropic phase boundary (MPB) from a fine structural viewpoint based on the investigation by transmission electron microscopy (TEM). By using the convergent beam electron diffraction (CBED) method, we observed the crystal symmetry in each of the three orientations — [001], [101], and [111] — and determined the point and space groups. We identified the point group as m since the mirror symmetry in the [100] and [101] orientations was observed in CBED patterns obtained at the [001] and [101] incidences and no symmetry was observed in those obtained at the [111] incidence. The classification based on the kinematical extinction rule could not be applied because of the difference in the fundamental lattice between lattice systems P and C. Therefore, we compared the symmetry observed in the CBED pattern with the theoretical prediction and identified the lattice system as P. In addition, we examined the presence or absence of the glide plane and screw axis and identified the space group as Pm. We showed that the spontaneous polarization (P_s) of the monoclinic (space group Pm) domain is in the (010) plane and lies on the M_c line connecting point T that expresses a tetragonal system directed toward the orientation and point O that expresses an orthorhombic system directed toward the orientation. We also revealed that four P_s vectors exist equivalently with respect to the poling direction. The angle formed by any two of these vectors was almost orthogonal when observed from the [110] orientation.
机译：通过改进的Bridgman技术生产的0.68Pb（Mg_（1/3）Nb_（2/3））O_3-0.32PbTiO_3单晶沿取向方向极化。我们基于透射电子显微镜（TEM）的研究，从精细的结构角度讨论了同相相界（MPB）中的低对称相域。通过使用会聚束电子衍射（CBED）方法，我们观察了[001]，[101]和[111]这三个方向的晶体对称性，并确定了点和空间组。我们将点组标识为m，因为在[001]和[101]入射角处获得的CBED图案中观察到[100]和[101]方向的镜像对称性，而在[111]入射角处获得的CBED图案中没有观察到对称性。发生率。由于晶格系统P和C之间的基本晶格不同，因此无法应用基于运动消光规则的分类。因此，我们将CBED模式中观察到的对称性与理论预测进行了比较，并将晶格系统识别为P.此外，我们检查了滑行平面和螺旋轴的存在与否，并将空间组标识为Pm。我们表明，单斜（空间群Pm）域的自发极化（P_s）在（010）平面中，并且位于M_c线上，该点连接表示方向的四方系统的点T和表示正交的点O。系统定向。我们还揭示了相对于极化方向而言，存在四个P_s向量。从[110]方向观察时，这些向量中的任何两个形成的角度几乎都是正交的。

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