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Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Strain-Driven Selective Stabilization of Metastable TiO2 Phases.

Jihoon Jeon1,2, Myungsu Jang1,2, Gwang Min Park1,2

  • 1KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|September 19, 2025
PubMed
Summary
This summary is machine-generated.

This study shows how to control titanium dioxide (TiO2) crystal structures using metal substrates. This strain-driven method stabilizes unique TiO2 phases for advanced material applications.

Keywords:
TiO2‐IIatomic layer depositionmetastable phaserutile

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Area of Science:

  • Materials Science
  • Thin Film Deposition
  • Crystallography

Background:

  • Stabilizing metastable titanium dioxide (TiO2) phases in thin films is difficult.
  • Controlling TiO2 phase is crucial for tuning its electronic and optical properties.

Purpose of the Study:

  • To demonstrate a strain-driven approach for selectively stabilizing metastable TiO2 phases.
  • To investigate the role of substrate orientation and lattice matching in phase selection.

Main Methods:

  • Low-temperature atomic layer deposition (ALD) of TiO2.
  • Utilizing (111)-oriented face-centered cubic (FCC) metal substrates (Ir, Pt).
  • Analyzing TiO2 phase formation and orientation via X-ray diffraction.

Main Results:

  • Selective stabilization of orthorhombic TiO2-II and rutile phases achieved.
  • Epitaxial (111) FCC substrates promoted TiO2-II formation via lattice matching.
  • Polycrystalline (111)-textured FCC substrates led to rutile formation due to strain relaxation.
  • TiO2-II films exhibited enhanced properties: higher density, refractive index, and dielectric constant (≈75-77) compared to anatase.

Conclusions:

  • In-plane strain and lattice matching are effective for engineering metastable TiO2 phases.
  • This method provides a low-temperature route for phase-selective growth of functional oxide films.