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Updated: Feb 10, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
The blocking effect of surface dislocations on oxygen tracer diffusion in SrTiO3
Henning Schraknepper1, Thomas E Weirich, Roger A De Souza
1Institute of Physical Chemistry, RWTH Aachen University, 52056 Aachen, Germany. desouza@pc.rwth-aachen.de.
Polishing creates a damaged zone in strontium titanate (SrTiO3) crystals, affecting oxygen diffusion. Dislocations within this zone, surrounded by space-charge tubes, significantly hinder oxygen movement.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Single-crystal strontium titanate (SrTiO3) is a key perovskite material.
- Surface polishing introduces a damaged zone with dislocations.
- Oxygen vacancies play a crucial role in SrTiO3 properties and diffusion.
Purpose of the Study:
- To investigate the interaction between oxygen vacancies and dislocations in polished SrTiO3.
- To model and experimentally validate the effect of dislocations on oxygen tracer diffusion.
- To develop a predictive model for oxygen diffusion in perovskite substrates.
Main Methods:
- Finite-element-method (FEM) calculations to simulate oxygen vacancy distribution.
- Simulation of oxygen tracer diffusion profiles based on vacancy distributions.
- Experimental validation using oxygen isotope exchange and depth-profiling on commercial SrTiO3.
Main Results:
- Polishing-induced damaged zone contains dislocations that interact with oxygen vacancies.
- Dislocations form space-charge tubes that deplete oxygen vacancies.
- These space-charge tubes significantly hinder oxygen diffusion in acceptor-doped SrTiO3.
Conclusions:
- Dislocations in SrTiO3 act as barriers to oxygen diffusion via space-charge effects.
- A 1D continuum model can approximate 3D diffusion problems involving dislocations.
- Understanding these diffusion mechanisms is vital for optimizing perovskite-based devices.
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