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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Electron diffraction and microscopy study of the structure and microstructure of the hexagonal perovskite Ba3Ti2MnO9
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Electron diffraction and microscopy study of the structure and microstructure of the hexagonal perovskite Ba3Ti2MnO9

机译：六方钙钛矿Ba3Ti2MnO9的结构和微观结构的电子衍射和显微镜研究

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摘要

This paper reports a structural and microstructural investigation of the hexagonal perovskite Ba3Ti2MnO9 using electron microscopy and diffraction. Convergent-beam electron diffraction (CBED) revealed the structure has the non-centrosymmetric space group P6(3)mc (186) at room temperature and at similar to 110 K. Compared with the centrosymmetric parent structure BaTiO3, with space group P6(3)/mmc, this represents a break in mirror symmetry normal to the c axis. This implies the Ti and Mn atoms are ordered on alternate octahedral sites along the < 0001 > direction in Ba3Ti2MnO9. Using high-resolution electron microscopy (HREM), we observed occasional 6H/12R interfaces on (0001) planes, however, no antiphase boundaries were observed, as were seen in Ba3Ti2RuO9. Using powder X-ray Rietveld refinement we have measured the lattice parameters from polycrystalline samples to be a = 5.6880 +/- 0.0005, c = 13.9223 +/- 0.0015 angstrom at room temperature.
机译：本文报道了利用电子显微镜和衍射对六方钙钛矿Ba3Ti2MnO9进行结构和微观结构研究。会聚束电子衍射（CBED）表明，该结构在室温且接近110 K时具有非中心对称的空间群P6（3）mc（186）。与中心对称的母体结构BaTiO3相比，空间群为P6（3） ）/ mmc，表示垂直于c轴的镜像对称性中断。这暗示着Ti和Mn原子在Ba3Ti2MnO9中沿着<0001>方向在交替的八面体位点上有序排列。使用高分辨率电子显微镜（HREM），我们在（0001）平面上偶尔观察到6H / 12R界面，但是，未观察到反相边界，如在Ba3Ti2RuO9中观察到的。使用粉末X射线Rietveld精修技术，我们在室温下测得多晶样品的晶格参数为a = 5.6880 +/- 0.0005，c = 13.9223 +/- 0.0015埃。

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