Cepstral scanning transmission electron microscopy imaging of severe lattice distortions

Yu Tsun Shao, Renliang Yuan, Haw Wen Hsiao, Qun Yang, Yang Hu, Jian Min Zuo

Research output: Contribution to journalArticlepeer-review

Abstract

The development of four-dimensional (4D) scanning transmission electron microscopy (STEM) using fast detectors has opened-up new avenues for addressing some of longstanding challenges in electron imaging. One of these challenges is how to image severely distorted crystal lattices, such as at a dislocation core. Here we develop a new 4D-STEM technique, called Cepstral STEM, for imaging disordered crystals using electron diffuse scattering. In contrast to analysis based on Bragg diffraction, which measures the average and periodic scattering potential, electron diffuse scattering can detect fluctuations caused by crystal disorder. Local fluctuations of diffuse scattering are captured by scanning electron nanodiffraction (SEND) using a coherent probe. The harmonic signals in electron diffuse scattering are detected through Cepstral analysis and used for imaging. By integrating Cepstral analysis with 4D-STEM, we demonstrate that information about the distortive part of electron scattering potential can be separated and imaged at nm spatial resolution. We apply the technique to the analysis of a dislocation core in SiGe and lattice distortions in a high entropy alloy.

Original languageEnglish (US)
Article number113252
JournalUltramicroscopy
DOIs
StateAccepted/In press - 2021

Keywords

  • 4D-STEM
  • Cepstral STEM
  • Dislocation core
  • Electron nanodiffraction
  • High entropy alloy
  • Severe lattice distortion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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