Anataselike Grain Boundary Structure in Rutile Titanium Dioxide

Area of Science:

• Materials Science
• Solid-State Physics
• Nanotechnology

Background:

• Nanoscale phases at grain boundaries in polycrystalline materials are key to controlling interface properties.
• Accurately determining the atomic structure of these complex interfacial defects is a significant challenge.

Purpose of the Study:

• To determine the atomic structure of a specific grain boundary in rutile titanium dioxide (TiO2).
• To identify and characterize any unique nanoscale phases formed at the interface.

Main Methods:

• Combined advanced electron microscopy with *ab initio* random structure searching.
• Performed detailed atomic structure analysis.
• Utilized complementary electron energy-loss spectroscopy (EELS).

Main Results:

• Successfully determined the atomic structure of an experimentally fabricated Σ13 (221) [11̅0] grain boundary in rutile TiO2.
• Identified a unique nanoscale phase at the grain boundary.
• This nanoscale phase exhibits striking similarities to the bulk anatase crystal structure.

Conclusions:

• The study provides a pathway to embed nanoscale anatase within rutile TiO2.
• Demonstrates the effectiveness of combining theoretical and experimental approaches for characterizing complex internal interfaces.
• Enables precise control over material properties through interface engineering.