Calcium cobaltite thin films with a ratio Ca/Co=1 were grown on (101)-NdGaO3 substrate by the pulsed laser deposition technique. The structure of the deposited metastable phase is solved using a precession electron diffraction 3D dataset recorded from a cross-sectional sample. It is shown that an ordered oxygen-deficient Ca2Co2O5+d perovskite of the brownmillerite-type with lattice parameters a= 0.546nm, b=1.488nm and c=0.546nm (SG: Ibm2) has been stabilized using the substrate induced strain. The structure and microstructure of this metastable cobaltite is further discussed and compared to related bulk materials based on our transmission electron microscopy investigations
Effect of electron doping on the magnetic correlations in the bilayered brownmillerite compound Ca_{2.5-x}La_{x}Sr_{0.5}GaMn_{2}O_{8}: a neutron diffraction study
Short-Range Structure and Phonon Assignment of the Brownmillerite-Type Oxide Ba$_{2}$In$_{2}$O$_{5}$ and its Hydrated Proton-Conducting Form BaInO$_{3}$H
利用拉曼、红外和非弹性中子散射光谱以及密度泛函理论计算研究了钙钛矿型氧化物Ba $_{2}$ In $_{2}$ O $_{5}$及其水合形式BaInO $_{3}$ H的振动光谱和短程结构。对于Ba $_{2}$ In $_{2}$ O $_{5}$，其可以被描述为具有InO $_{6}$八面体和InO $_{4}$四面体的交替层的缺氧钙钛矿结构，结果证实了$Icmm$对称性的短程结构，其特征在于InO $_{4}$四面体的连续层的随机取向。对于水合质子传导形式BaInO $_{3}$ H，结果表明短程结构比先前基于中子衍射提出的$P4/mbm$对称性更复杂，而是表明质子构型接近Martinez等人预测的最低能量结构[J.- R.马丁内斯角E. Moen，S. Stoelen，N. L. Allan，J. of Solid State Chem.180，3388，（2007）]。一个强烈的拉曼活性振动在150厘米$^{-1}$被确定为一个独特的指纹，这种质子配置。
Suppressing dynamical diffraction artefacts in differential phase contrast scanning transmission electron microscopy of long-range electromagnetic fields via precession
Probing Temperature at Nanoscale through Thermal Vibration Characterization using Scanning Precession Electron Diffraction
State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Future Material Innovation Center, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University（上海交通大学）；School of Physics and Electronics, Hunan Key Laboratory of Super Microstructure and Ultrafast Process, State Key Laboratory of Powder Metallurgy, Central South University（中南大学）；Research Center for Scientific Data Hub, Zhejiang Lab（浙江实验室）；School of Physics and Astronomy, Shanghai Jiao Tong University, Key Laboratory for Particle Astrophysics and Cosmology (MOE), SKLPPC（上海交通大学）；School of Mechanical Engineering, Shanghai Jiao Tong University（上海交通大学）
A method for crystallographic mapping of an alpha-beta titanium alloy with nanometre resolution using scanning precession electron diffraction and open-source software libraries
Automated crystal orientation mapping by precession electron diffraction assisted four-dimensional scanning transmission electron microscopy (4D-STEM) using a scintillator based CMOS detector
In Situ Nanometer-Resolution Strain and Orientation Mapping for Gas-Solid Reactions via Precession-Assisted Four-dimensional Scanning Transmission Electron Microscopy
Stroboscopic X-ray Diffraction Microscopy of Dynamic Strain in Diamond Thin-film Bulk Acoustic Resonators for Quantum Control of Nitrogen Vacancy Centers
Free, flexible and fast: orientation mapping using the multi-core and GPU-accelerated template matching capabilities in the python-based open source 4D-STEM analysis toolbox Pyxem
Unveiling Unconventional Ferroelectric Switching in Multiferroic Ga0.6 Fe1.4O3 Thin Films Through Multiscale Electron Microscopy Investigations
了解铁电材料中起作用的极化转换机制对于它们在电子器件中的开发至关重要。传统的基于中心对称参考结构的机制解释了大多数常见的位移铁电材料中的铁电性，对于一些新诊断的铁电材料如Ga 2-xFexO 3（0.8 < x < 1.4）化合物来说，该机制过于耗能。一些替代的理论命题已经提出，需要实验证实。双尺度电子显微镜研究进行薄膜的Ga 0.6 Fe 1.4 O 3多铁性化合物。大规模的旋进辅助电子衍射层析成像研究首先允许确定化合物在薄膜中采用的结构，甚至允许细化该结构内的原子位置。阳离子迁移率建议通过存在额外的电子密度的两个原子的位置。一个本地的原位高分辨率扫描透射电子显微镜研究，然后允许确认这些流动性，通过直接点连续采集的图像上的阳离子位移。整个研究证实了一个非常规的开关机制，通过局部畴壁运动在该化合物。
