Deep sub-angstrom resolution imaging by electron ptychography with misorientation correction

Sha, Haozhi; Cui, Jizhe; Yu, Rong

doi:10.1126/sciadv.abn2275

Cited by 30 publications

(27 citation statements)

References 54 publications

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“…Ptychographic reconstruction were performed using the EMPTY program (Beijing Superresolution Technology Co., Ltd.), which implements the adaptive-propagator ptychography method 42 and is GPU-accelerated. The real space pixel size in the transmission function is 0.14 Å. Mixed-state algorithm 35 , 67 with six probe modes were used, which were shown in Supplementary Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Capable of imaging both heavy and light atoms 41 , it becomes a powerful tool to investigate oxide materials. Very recently, the adaptive-propagator (APP) method 42 was developed in the frame of multislice electron ptychography 34 , 43 to remove the misorientation effect. It suggests possible application of deep-sub-angstrom resolution ptychographic imaging in real materials with intrinsic variation of crystal orientation around defects like dislocations and interfaces.…”

Section: Introductionmentioning

confidence: 99%

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Sub-nanometer-scale mapping of crystal orientation and depth-dependent structure of dislocation cores in SrTiO3

Sha

Cao

et al. 2023

Nat Commun

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Defects in crystals play a fundamental role in modulating mechanical, electrical, luminescent, and magnetic behaviors of materials. However, accurate measurement of defect structures is hindered by symmetry breaking and the corresponding complex modifications in atomic configuration and/or crystal tilt at the defects. Here, we report the deep-sub-angstrom resolution imaging of dislocation cores via multislice electron ptychography with adaptive propagator, which allows sub-nanometer scale mapping of crystal tilt in the vicinity of dislocation cores and simultaneous recovery of depth-dependent atomic structure of dislocations. The realization of deep-sub-angstrom resolution and depth-dependent imaging of defects shows great potential in revealing microstructures and properties of real materials and devices.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sub-nanometer-scale mapping of crystal orientation and depth-dependent structure of dislocation cores in SrTiO3

Sha

Cao

et al. 2023

Nat Commun

Self Cite

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“…At present, temperature-and electric-field-dependent in situ experiments can be conducted by the TEM [103,104], which enable the detection of the domain-wall evolution during the temperature variation or under the electric-field stimulation, respectively. Sha et al [105] recently reported a novel TEM technique, where a deep sub-angstrom resolution imaging with a misorientation correction was developed to largely reduce the experimental difficulties of electron ptychography. The development of detectors also led to advanced imaging modes, such as differential phase contrast and fourdimension scanning transmission electron microscopy (4D-STEM) [106,107].…”

Section: Possible Solutionsmentioning

confidence: 99%

Sodium lithium niobate lead-free piezoceramics for high-power applications: Fundamental, progress, and perspective

LI¹,

Li²,

Juan³

et al. 2023

Journal of Advanced Ceramics

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With the capability of interconversion between electrical and mechanical energy, piezoelectric materials have been revolutionized by the implementation of perovskite-piezoelectric-ceramic-based studies over 70 years. In particular, the market of piezoelectric ceramics has been dominated by lead zirconate titanate for decades. Nowadays, the research on piezoelectric ceramics is largely driven by cutting-edge technological demand as well as the consideration of a sustainable society. Hence, environmental-friendly lead-free piezoelectric materials have emerged to replace lead-based Pb(Zr,Ti)O 3 (PZT) compositions. Owing to the inherent high mechanical quality factor (Q m ) and low energy loss, (Li,Na)NbO 3 (LNN) materials have recently drawn increasing attention and brought advantages to high-power piezoelectric applications. Although the crystallographic structures of LNN materials were intensively investigated for decades, the technical strategies for electrical performance are still limited. As a result, the property enhancement appears to have approached a plateau. This review traces the progress in the development of LNN materials, starting from the polymorphism in terms of the crystal structures, phase transitions, and local structural distortions. Then, the key milestone works on the functional tunability of LNN are reviewed with emphasis on involved engineering approaches. The exceptional performance at a large vibration velocity makes LNN ceramics promising for high-power applications, such as ultrasonic welding (UW) and ultrasonic osteotomes (UOs). The remaining challenges and some strategic insights for synergistically engineering the functional performance of

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“…The redundancy of the 4D-STEM dataset allows the correction of experimental imperfections and aberrations through reconstruction. For example, position correction , and zone-axis correction have been realized using modified algorithms. In addition, the multislice , and mixed-state methods, , which can be integrated into iterative algorithms (e.g., ePIE and ML algorithms), have been developed to address the problems of multiple scattering associated with thick specimens and the partial incoherence of electron beams, respectively.…”

Section: Data Acquisition and Processing Of 4d-stem Ptychographymentioning

confidence: 99%

“…The ability of various existing algorithms to manage ultra-low-dose large-defocus data should be explored, and new algorithms that can meet these requirements should also be developed. Several methods for scanning coordinate correction , and zone-axis correction have been developed to tolerate imperfect experimental conditions to a certain extent. These methods are potentially valuable for highly beam-sensitive materials that require rapid operation without time to perfect the imaging conditions.…”

Section: Conclusion and Outlookmentioning

confidence: 99%

4D-STEM Ptychography for Electron-Beam-Sensitive Materials

Zhang

Han

2022

ACS Cent. Sci.

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Recent advances in high-speed pixelated electron detectors have substantially facilitated the implementation of four-dimensional scanning transmission electron microscopy (4D-STEM). A critical application of 4D-STEM is electron ptychography, which reveals the atomic structure of a specimen by reconstructing its transmission function from redundant convergent-beam electron diffraction patterns. Although 4D-STEM ptychography offers many advantages over conventional imaging modes, this emerging technique has not been fully applied to materials highly sensitive to electron beams. In this Outlook, we introduce the fundamentals of 4D-STEM ptychography, focusing on data collection and processing methods, and present the current applications of 4D-STEM ptychography in various materials. Next, we discuss the potential advantages of imaging electron-beam-sensitive materials using 4D-STEM ptychography and explore its feasibility by performing simulations and experiments on a zeolite material. The preliminary results demonstrate that, at the low electron dose required to preserve the zeolite structure, 4D-STEM ptychography can reliably provide higher resolution and greater tolerance to the specimen thickness and probe defocus as compared to existing imaging techniques. In the final section, we discuss the challenges and possible strategies to further reduce the electron dose for 4D-STEM ptychography. If successful, it will be a game-changer for imaging extremely sensitive materials, such as metal−organic frameworks, hybrid halide perovskites, and supramolecular crystals.

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Deep sub-angstrom resolution imaging by electron ptychography with misorientation correction

Cited by 30 publications

References 54 publications

Sub-nanometer-scale mapping of crystal orientation and depth-dependent structure of dislocation cores in SrTiO3

Sub-nanometer-scale mapping of crystal orientation and depth-dependent structure of dislocation cores in SrTiO3

Sodium lithium niobate lead-free piezoceramics for high-power applications: Fundamental, progress, and perspective

4D-STEM Ptychography for Electron-Beam-Sensitive Materials

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