The electronic properties of an oxygen vacancy at ZrO2- terminated (001) surfaces of a cubic PbZrO3: Computer simulations from the first principles

E. A. Kotomin, S. Piskunov*, Yu F. Zhukovskii, R. I. Eglitis, A. Gopejenko, D. E. Ellis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Combining B3PW hybrid exchange-correlation functional within the density functional theory (DFT) and a supercell model, we calculated from the first principles the electronic structure of both ideal PbZrO3 (001) surface (with ZrO2- and PbO-terminations) and a neutral oxygen vacancy also called the F center. The atomic relaxation and electronic density redistributions are discussed. Thermodynamic analysis of pure surfaces indicates that ZrO2 termination is energetically more favorable than PbO-termination. The O vacancy on the ZrO2-surface attracts ≈0.3 e (0.7 e in the bulk PbZrO3), while the remaining electron density from the missing O2- ion is localized mostly on atoms nearest to a vacancy. The calculated defect formation energy is smaller than in the bulk which should lead to the vacancy segregation to the surface. Unlike Ti-based perovskites, the vacancy-induced (deep) energy level lies in PbZrO3 in the middle of the band gap.

Original languageEnglish (US)
Pages (from-to)4258-4263
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume10
Issue number29
DOIs
StatePublished - Jul 25 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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