Defect energetics in the SrTiO3-LaCrO3 system

Navaratnarajah Kuganathan, Federico Baiutti, Albert Tarancon, Jurgen Fleig, Alexander Chroneos

Research output: Contribution to journalArticlepeer-review

Abstract

Oxide interfaces have attracted a huge amount of interest in recent years due to their novel functionalities that are not possible in bulk. Here we employ atomistic simulation techniques to study the defect properties and oxygen ion migration energy in bulk SrTiO3, LaCrO3 and SrTiO3–LaCrO3 interface. The SrO and La2O3 “Schottky-like” defects are found to be the most favourable intrinsic defects in their respective bulk structures and also at interface layers. While defect energies calculated at interface layers are not significantly changed compared to that calculated in the bulk LaCrO3, significant changes are noted in Schottky defects and oxygen Frenkel between bulk SrTiO3 and the interface. The activation energies for the oxygen ion diffusion in bulk SrTiO3 and LaCrO3 are calculated to be 0.64 eV and 0.53 eV, respectively, suggesting that both materials will present favourable diffusion pathways. In general, there is a reduction in the activation energies of oxygen ion migration at the interface compared to bulk structures. In particular, in the Cr layer, activation energy is calculated to be 0.36 eV implying that interface plays an important role in the oxygen ion migration and therefore such an interface is of interest for use in advanced electrochemical devices.
Original languageEnglish
Article number115570
Number of pages7
JournalSolid State Ionics
Volume361
Early online date5 Feb 2021
DOIs
Publication statusE-pub ahead of print - 5 Feb 2021

Bibliographical note

The research leading to these results has received funding from the European Union's H2020 Programme under Grant Agreement no 824072 – HARVESTORE.

Keywords

  • Atomistic simulation
  • Defects
  • Diffusion
  • Interface
  • SrTiO

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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