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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Crystal Structure of Misfit-Layered Compound [Bi_(1.94)Ba_(1.83)O_y]_(0.56)[RhO_2]
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Crystal Structure of Misfit-Layered Compound [Bi_(1.94)Ba_(1.83)O_y]_(0.56)[RhO_2]

机译：错配层状化合物[Bi_（1.94）Ba_（1.83）O_y] _（0.56）[RhO_2]的晶体结构

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摘要

The modulated crystal structure of Bi_(2.12)Ba_(2.00)Rh_(1.95)O_x has been studied by electron diffraction measurements and high-resolution electron microscopy. The crystal structure consists of two interpenetrating subsystems of a RhO_2 sheet and a distorted four-layered rock-salt-type (Bi,Ba)O block. Both subsystems have common a- and c-axes and a β-angle with a = 5.38 A, c = 15.15 A and β = 95.3°. On the other hand, the crystal structure is incommensurate along the b-axes; b_1 = 3.05 A for the RhO_2 sheet and b_2 = 5.45 A for the (Bi,Ba)O block. The misfit ratio and the analytical composition give the chemical formula of [Bi_(1.94)Ba_(1.83)O_y]_(0.56)[RhO_2]. This compound has two modulation vectors, q_1 = -a~* + 0.56b_1~* and q_2 = 0.11b_1~* + 0.35c~*, and the superspace group is assigned as a C2/m(1α0, 0βγ)-type on the basis of the systematic absence of reciprocal lattice points shown in the electron diffraction patterns. This modulation vector q_2 is different from the one in [Bi_(1.79)Sr_(1.98)O_y]_(0.63)[RhO_2], which has recently been studied by the authors. An additional modulation vector, q_3 = 0.12a~* + 0.10b_1~* is locally observed. High-resolution images taken with the incident electron beam parallel to the a- and c-axes clearly exhibit modulated atomic arrangements. This compound is characterized by not only the displacement modulation but also the concentration modulation in the rock-salt subsystem.
机译：通过电子衍射测量和高分辨率电子显微镜研究了Bi_（2.12）Ba_（2.00）Rh_（1.95）O_x的调制晶体结构。晶体结构由RhO_2片和变形的四层岩盐型（Bi，Ba）O块的两个互穿的子系统组成。两个子系统均具有共同的a轴和c轴，以及一个角度为a = 5.38 A，c = 15.15 A和β= 95.3°的β角。另一方面，沿b轴的晶体结构是不相称的。 RhO_2片的b_1 = 3.05 A，（Bi，Ba）O块的b_2 = 5.45A。失配比和分析组成给出了化学式为[Bi_（1.94）Ba_（1.83）O_y] _（0.56）[RhO_2]。该化合物具有两个调制向量q_1 = -a〜* + 0.56b_1〜*和q_2 = 0.11b_1〜* + 0.35c〜*，并且超空间组被分配为C2 / m（1α0，0βγ）型电子衍射图谱中显示的系统性缺乏互逆晶格点的基础。该调制矢量q_2不同于作者最近研究的[Bi_（1.79）Sr_（1.98）O_y] _（0.63）[RhO_2]中的调制矢量。在本地观察到另外的调制矢量q_3 = 0.12a〜* + 0.10b_1〜*。用平行于a轴和c轴的入射电子束拍摄的高分辨率图像清楚地显示出已调制的原子排列。该化合物的特征不仅在于岩盐子系统中的位移调制，而且还包括浓度调制。

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