# Observation of vacancy defect migration in the cation sublattice of complex oxides by 18O tracer experiments.

@article{Meyer2003ObservationOV,
title={Observation of vacancy defect migration in the cation sublattice of complex oxides by 18O tracer experiments.},
author={Ren{\'e} Meyer and Rainer Waser and Julia Helmbold and G{\"u}nter Prof. Dr.-Ing. Borchardt},
journal={Physical review letters},
year={2003},
volume={90 10},
pages={
105901
}
}
We report on 18O tracer diffusion experiments and model calculations for the study of cation vacancy migration in oxide crystals. The model takes advantage of the electrostatic coupling forces between anion and cation defects that allow the evolution of the cation vacancy profile to be observed by anion tracer experiments. Applied to SrTiO3, the ambipolar diffusion of strontium vacancies with H(A)=3.5 eV was found to be the dominant reequilibration mechanism of the cation sublattice. This… Expand

#### Figures and Topics from this paper

Strontium migration assisted by oxygen vacancies in SrTiO3 from classical and quantum mechanical simulations
• Physics
• 2011
We present the pathways for strontium ion migration in SrTiO3, which are based on an exploration of the potential energy landscape through a combination of classical and quantum mechanicalExpand
The influence of neighboring vacancies and their charge state on the atomic migration of LaAlO3
• Chemistry
• 2013
We investigated the effects of neighboring vacancies and their charge state on ion migration in rhombohedral-LaAlO3. Our results show that the oxygen migration energy is greatly influenced by theExpand
First-principles study on migration mechanism in SrTiO3
• Physics
• 2011
The atomistic behavior of migration in SrTiO3 was investigated by first-principles nudged elastic band calculations. Calculated migration energies for Sr and oxygen are consistent with experimentalExpand
Schottky defects in cubic lattice of SrTiO3
• Chemistry
• 2009
Abstract Structural and electronic properties produced by formation of Schottky defects in cubic structure of SrTiO3 crystal are investigated by means of a quantum-chemical simulation based on theExpand
Oxygen vacancy migration in compressively strained SrTiO3
The intrinsic properties of strontium titanate render it promising in applications such as gate dielectrics and capacitors. However, there is growing evidence that oxygen vacancies significantlyExpand
Computational Study of Oxygen Diffusion along a[100] Dislocations in the Perovskite Oxide SrTiO3.
• Materials Science, Medicine
• ACS applied materials & interfaces
• 2016
The results indicate that, at elevated temperatures, the two types of dislocation core that make up the boundary are stable and that oxygen-deficient cores maintain their dissociated structures, and provide further support for the decoupled model of filament formation in resistively switching SrTiO3. Expand
Complex behaviour of vacancy point-defects in SrRuO3 thin films.
• Materials Science, Medicine
• Physical chemistry chemical physics : PCCP
• 2015
A model-cation sublattice equilibration is proposed-that accounts for the appearance of two features in both anion and cation diffusion profiles of thin-film SrRuO3, amongst the lowest measured for nominally undoped perovskite-type oxides. Expand
Impact of tensile strain on the oxygen vacancy migration in SrTiO3: Density functional theory calculations
• Chemistry
• 2013
Strontium titanate is a promising dielectric material for device applications including capacitors and gate dielectrics. However, oxygen vacancies, which are inevitable donor defects mobile underExpand
Study on Defects in Fe-Doped SrTiO3 by Positron Annihilation Lifetime Spectroscopy
• Materials Science
• Wuhan University Journal of Natural Sciences
• 2019
SrTi1−xFexO3−δ ceramics were prepared using a traditional solid-state reaction method. From X-ray diffraction (XRD) result, we found that the doped Fe3+ dissolved in the lattice, and no secondaryExpand
Metadynamics simulations of strontium-vacancy diffusion in SrTiO3
• Materials Science
• 2021
The sluggish diffusion of strontium vacancies in the perovskite-oxide ${\mathrm{SrTiO}}_{3}$ was studied by means of classical metadynamics simulations. Two different mechanisms were examined: theExpand

#### References

SHOWING 1-10 OF 27 REFERENCES
Cationic Surface Segregation in Donor-Doped SrTiO3 Under Oxidizing Conditions
• Materials Science
• 2002
The influence of high temperature oxygen annealing on (100) oriented donor-doped SrTiO3 single crystals was studied. Crystalline precipitates were found on the optical scale on surfaces ofExpand
Computer Simulation Studies of Strontium Titanate
• Chemistry
• 1995
We present the results of computer simulation studies of SrTiO3. After deriving a reliable potential model, we concentrate on the properties of defects and dopants. Our calculations are used toExpand
Nonstoichiometry in SrTiO3
• Materials Science
• 1981
The defect chemistry of polycrystalline has been studied by means of the equilibrium electrical conductivity as a function of temperature, oxygen activity, Sr/Ti ratio, and impurity additions.Expand
dc Electrical Degradation of Perovskite-Type Titanates: I, Ceramics
• Materials Science
• 1990
The rate of the resistance degradation of doped SrTiO3 ceramics is investigated as a function of various external and material parameters. The effects of the mutually interrelated parameters dcExpand
Defect Chemistry of Donor‐Doped and Undoped Strontium Titanate Ceramics between 1000° and 1400°C
• Chemistry
• 2005
The electrical conductivity, sigma, of donor-doped and undoped strontium titanate (SrTiO3) ceramics and, in some cases, single crystals, Sr1-xLaxTiO3 (0 ≤ to x ≤ 0.1), was investigated in theExpand
Oxygen ion diffusion in single crystal SrTiO3
• Chemistry
• 1965
Abstract The oxygen ion self-diffusion coefficient has been determined for single crystal SrTiO 3 between 825° and 1525°C. The rate of exchange between oxygen gas enriched with the stable isotope, OExpand
Determination of acceptor concentrations and energy levels in oxides using an optoelectrochemical technique
• Chemistry
• 1990
Abstract An electrochemical concentration polarization can be employed to completely oxidize acceptor centres in large band-gap oxides and, thus, supplies a calibration for those detecting techniquesExpand
Tracer diffusion and chemical diffusion of oxygen in acceptor doped SrTiO"3
• Chemistry
• 2000
Abstract Oxygen tracer and oxygen chemical diffusion coefficients have been determined for single crystalline SrTiO 3 under defined temperature ( f ), oxygen partial pressure ( p (O 2 )), andExpand
Relations between the Concentrations of Imperfections in Crystalline Solids
• Materials Science
• 1956
Publisher Summary The chapter presents a study on relations between the concentrations of imperfections in crystalline solids. Many properties of crystalline solids, such as the electronic or ionicExpand
Perovskite-type oxides—The new approach to high- T c superconductivity
• Physics
• 1988
The author's Nobel lecture is reprinted in which they describe how they became involved with high-Tc superconductors. The properties of the new superconductors are discussed. (AIP)