BiFeO3 domain wall energies and structures: A combined experimental and density functional theory+U study

Yi Wang, Chris Nelson, Alexander Melville, Benjamin Winchester, Shunli Shang, Zi Kui Liu, Darrell G. Schlom, Xiaoqing Pan, Long Qing Chen

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Abstract

We determined the atomic structures and energies of 109, 180, and 71 domain walls in BiFeO3, combining density functional theory+U calculations and aberration-corrected transmission electron microscopy images. We find a substantial Bi sublattice shift and a rather uniform Fe sublattice across the walls. The calculated wall energies (γ) follow the sequence γ10918071 for the 109, 180, and 71 walls. We attribute the high 71 wall energy to an opposite tilting rotation of the oxygen octahedra and the low 109 wall energy to the opposite twisting rotation of the oxygen octahedra across the domain walls.

Original languageEnglish (US)
Article number267601
JournalPhysical Review Letters
Volume110
Issue number26
DOIs
StatePublished - Jun 24 2013

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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