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Issue 32, 2015
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Thermodynamic properties of neutral and charged oxygen vacancies in BaZrO3 based on first principles phonon calculations

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Abstract

The structural, electronic and thermodynamic properties of neutral Image ID:c5cp02529j-t1.gif and positively doubly charged Image ID:c5cp02529j-t2.gif oxygen vacancies in BaZrO3 are addressed by first principles phonon calculations. The calculations are performed using two complementary first principles approaches and functionals; the linear combination of atomic orbitals (LCAO) within the hybrid Hartree–Fock and density functional theory formalism (HF-DFT), and the projector augmented plane wave approach (PAW) within DFT. Phonons are shown to contribute significantly to the formation energy of the charged oxygen vacancy at high temperatures (∼1 eV at 1000 K), due to both its large distortion of the local structure, and its large negative formation volume. For the neutral vacancy, the resulting lattice distortions, and thus the contributions from phonons to the free formation energy, are significantly smaller. As a result, phonons affect the relative stability of the two defects at finite temperatures and the charge transition level for oxygen vacancies (+2/0) changes from 0.42 to 0.83 eV below the conduction band bottom from 0 K to 1000 K.

Graphical abstract: Thermodynamic properties of neutral and charged oxygen vacancies in BaZrO3 based on first principles phonon calculations

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Article information


Submitted
30 Apr 2015
Accepted
03 Jun 2015
First published
27 Jul 2015

Phys. Chem. Chem. Phys., 2015,17, 20765-20774
Article type
Paper

Thermodynamic properties of neutral and charged oxygen vacancies in BaZrO3 based on first principles phonon calculations

T. S. Bjørheim, M. Arrigoni, D. Gryaznov, E. Kotomin and J. Maier, Phys. Chem. Chem. Phys., 2015, 17, 20765
DOI: 10.1039/C5CP02529J

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