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Vacancy-Induced Z-Contrast Anomaly in Self-Assembled (Ti,V)O2 Heterostructure.

Hyeji Sim1, Seung-Hyun Heo1, Gyung-Min Park1

  • 1Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|March 30, 2026
PubMed
Summary
This summary is machine-generated.

In titanium vanadium oxide heterostructures, vanadium-rich layers show higher contrast in annular dark-field scanning transmission electron microscopy (ADF-STEM) due to oxygen vacancies. These vacancies accumulate via specific crystallographic pathways in the rutile structure.

Keywords:
de‐channelingoxygen vacanciesscanning transmission electron microscopyself‐assembled heterostructurevanadium dioxide

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Electron Microscopy

Background:

  • Annular dark-field scanning transmission electron microscopy (ADF-STEM), or Z-contrast imaging, typically shows brighter contrast for elements with higher atomic numbers.
  • Self-assembled (Ti,V)O2 heterostructures feature alternating V-rich and Ti-rich layers.

Purpose of the Study:

  • To investigate the unexpected higher contrast in V-rich layers of (Ti,V)O2 heterostructures observed via ADF-STEM.
  • To elucidate the underlying mechanisms responsible for the observed contrast differences.

Main Methods:

  • Annular dark-field scanning transmission electron microscopy (ADF-STEM) imaging.
  • Local strain mapping.
  • Electron energy loss spectroscopy (EELS).

Main Results:

  • ADF-STEM imaging revealed unexpectedly higher contrast in V-rich layers of (Ti,V)O2, despite Ti and V having similar atomic numbers (Z=22 and Z=23).
  • Analyses confirmed dominant oxygen vacancy formation in V-rich layers.
  • The accumulation of oxygen vacancies was facilitated by the [001] channel pathways inherent to the rutile structure.

Conclusions:

  • The higher contrast in V-rich layers is attributed to the accumulation of oxygen vacancies.
  • Crystallographic pathways critically influence oxygen vacancy diffusion in rutile-based heterostructures.
  • This finding provides insights into controlling defect formation in complex oxide materials.