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Atomic-level imaging of Mo-V-O complex oxide phase intergrowth grain boundaries and defects using HAADF-STEM

机译:使用HAADF-STEM对Mo-V-O复合氧化物相共生晶界和缺陷进行原子级成像

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摘要

In this work, we structurally characterize defects, grain boundaries, and intergrowth phases observed in various Mo-V-O materials using aberration-corrected high-angle annular dark-field (HAADF) imaging within a scanning transmission electron microscope (STEM). Atomic-level imaging of these preparations clearly shows domains of the orthorhombic M1-type phase intergrown with the trigonal phase. Idealized models based on HAADF imaging indicate that atomic-scale registry at the domain boundaries can be seamless with several possible trigonal and M1-type unit cell orientation relationships. The alignment of two trigonal domains separated by an M1-type domain or vice versa can be predicted by identifying the number of rows/columns of parallel symmetry operators. Intergrowths of the M1 catalyst with the M2 phase or with the Mo5O14-type phase have not been observed. The resolution enhancements provided by aberration-correction have provided new insights to the understanding of phase equilibria of complex Mo-V-O materials. This study exemplifies the utility of STEM for the characterization of local structure at crystalline phase boundaries.
机译:在这项工作中,我们使用扫描透射电子显微镜(STEM)中的像差校正高角度环形暗场(HAADF)成像,对各种Mo-V-O材料中观察到的缺陷,晶界和共生相进行了结构表征。这些制剂的原子水平成像清楚地显示了与三角相互生的正交M1型相的域。基于HAADF成像的理想化模型表明,域边界处的原子级配准可以与几种可能的三角形和M1型晶胞取向关系无缝连接。可以通过识别平行对称算子的行数/列数来预测由M1型域分开的两个三角域的排列,反之亦然。尚未观察到M1催化剂与M2相或Mo5O14型相的共生。通过像差校正提供的分辨率增强为了解复杂的Mo-V-O材料的相平衡提供了新的见识。这项研究举例说明了STEM在表征晶相边界处的局部结构方面的实用性。

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