A5026891815- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Crystallography and Radiation Phenomena
- Electronic and Structural Properties of Oxides
- Electron and X-Ray Spectroscopy Techniques
- Zeolite Catalysis and Synthesis
- Advanced Materials Characterization Techniques
- Digital Holography and Microscopy
- Advanced Data Processing Techniques
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Dark Matter and Cosmic Phenomena
- High Entropy Alloys Studies
- Random lasers and scattering media
- Characterization and Applications of Magnetic Nanoparticles
- Medical Imaging Techniques and Applications
- Electrocatalysts for Energy Conversion
- Catalysis and Oxidation Reactions
- High-Temperature Coating Behaviors
- Magnetic Properties and Synthesis of Ferrites
- Catalytic Processes in Materials Science
Tsinghua University
2021-2025
State Key Laboratory of New Ceramics and Fine Processing
2021-2023
Superresolution imaging of solids is essential to explore local symmetry breaking and derived material properties. Electron ptychography one the most promising schemes realize superresolution beyond aberration correction. However, reach both deep sub-angstrom resolution accurate measurement atomic structures, it still required for electron beam be nearly parallel zone axis crystals. Here, we report an efficient robust method correct specimen misorientation in ptychography, giving specimens...
Sub-angstrom resolution imaging of porous materials like zeolites is important to reveal their structure-property relationships involved in ion exchange, molecule adsorption and separation, catalysis. Using multislice electron ptychography, we successfully measured the atomic structure zeolite at sub-angstrom lateral for 100-nanometer-thick samples. Both depth deformations straight channels are mapped, showing three-dimensional structural inhomogeneity flexibility. Since most industrial...
Interstitial solutes, such as carbon in steels, are effective solid-solution hardening agents. These alloying elements believed to occupy the octahedral interstices body-centered-cubic (bcc) metals. Using deep-sub-angstrom-resolution electron ptychography, here first experimental evidence directly observe individual oxygen atoms a highly concentrated bcc solid solution-the (TiNbZr)86 O12 C1 N1 medium-entropy alloy (MEA)-is provided, whereby interstitial sites which located discerned. In...
Defects in crystals play a fundamental role modulating mechanical, electrical, luminescent, and magnetic behaviors of materials. However, accurate measurement defect structures is hindered by symmetry breaking the corresponding complex modifications atomic configuration and/or crystal tilt at defects. Here, we report deep-sub-angstrom resolution imaging dislocation cores via multislice electron ptychography with adaptive propagator, which allows sub-nanometer scale mapping vicinity...
Antiferromagnetic imaging is critical for understanding and optimizing the properties of antiferromagnetic materials devices. Despite widespread use high-energy electrons atomic-scale imaging, they have low sensitivity to spin textures. Typically, magnetic contribution phase a electron wave weaker than one percent electrostatic potential. Here, we demonstrate direct lattice through precise retrieval via ptychography, paving way
Even when aberration-corrected electron microscopy is in the ascendant, microstructural analysis of materials faces problems residual aberrations, zone-axis deviation, surface damage, and irradiation which not only have kept spatial resolution microscope at about 0.5 Å for years, but also limited reliability accuracy analysis. Electron ptychography a computational imaging method that utilizes rich information four-dimensional scanning transmission datasets to obtain high resolution, phase...
The twinning plane of crystals with a face-centered-cubic (FCC) structure is usually the (111) plane, as found in FCC metals and oxides sublattices oxygen, like rock-salt-type NiO spinel-type Fe3O4. Surprisingly, we this work that CoO (112) although Co adjacent to Ni periodic table. atomic electronic structures CoO(112) twin boundary in-plane shift vector 1/2[111] have been studied combining aberration-corrected scanning transmission electron microscopy (STEM), electron-energy-loss...
It is generally assumed that a high spatial resolution of microscope requires large numerical aperture the imaging lens or detector. In this study, information limit 15 pm achieved in transmission electron microscopy using only bright-field disk (small aperture) via multislice ptychography. The results indicate high-frequency has been encoded electrons scattered to low angles due multiple scattering objects, making it possible break diffraction
Polar topologies, such as vortex and skyrmion, have attracted significant interest due to their unique physical properties promising applications in high-density memory devices. Currently, most polar vortices are observed heterostructures containing ferroelectric materials constrained by substrates. In this study, we unravel arrays of formed twisted freestanding bilayers composed SrTiO3, a quantum-paraelectric material. Depth-resolved structures the measured with deep-sub-angstrom resolution...
It is generally assumed that a high spatial resolution of microscope requires large numerical aperture the imaging lens or detector. In this study, information limit 15 pm achieved in transmission electron microscopy using only bright-field disk (small aperture) via multislice ptychography. The results indicate high-frequency has been encoded due to multiple scattering electrons objects, making it possible break diffraction
Tilting planar samples for multi-zone-axes observation is a routine procedure in electron microscopy. However, this process invariably introduces optical path differences the beam across different sample positions, significantly compromising image quality, particularly over large fields of view. To address challenge, we developed difference ptychography (PDP), method capable decoupling from four-dimensional data during reconstruction. This enables acquisition high-quality, large-scale...
Atomic-scale characterization of spin textures in solids is essential for understanding and tuning properties magnetic materials devices. While high-energy electrons are employed atomic-scale imaging materials, they insensitive to the textures. In general, contribution phase electron wave 1000 times weaker than electrostatic potential. Via accurate retrieval through ptychography, here we show that can be separated from one, opening door atomic-resolution spintronic