Structure and diffusion of intrinsic defect complexes in LiNbO3 from density functional theory calculations

Haixuan Xu, Donghwa Lee, Susan B. Sinnott, Volkmar Dierolf, Venkatraman Gopalan, Simon R. Phillpot

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Organized defect clusters in non-stoichiometric LiNbO3 are known to dominate macroscale ferroelectric properties; yet the detailed nature of these defects is currently unknown. Here, the relative stabilities of various defect cluster arrangements of lithium vacancies around a niobium antisite in LiNbO3 are determined using density functional theory combined with thermodynamic calculations. Their effects on the ferroelectricity of the system are also discussed. It is found that at room temperature the non-uniaxial dipole moments associated with the defect clusters could affect the properties of the system locally. The diffusion mechanism is predicted to be through first nearest neighbor jumps on the Li sublattice. The diffusivity of the lithium vacancy is found to be extremely low at room temperature, which indicates that the defect complexes should be rather stable.

Original languageEnglish (US)
Article number135002
JournalJournal of Physics Condensed Matter
Volume22
Issue number13
DOIs
StatePublished - Mar 26 2010

Fingerprint

Density functional theory
density functional theory
Defects
defects
Lithium
Vacancies
lithium
Niobium
Ferroelectricity
ferroelectricity
Dipole moment
room temperature
niobium
sublattices
Ferroelectric materials
diffusivity
dipole moments
lithium niobate
Thermodynamics
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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abstract = "Organized defect clusters in non-stoichiometric LiNbO3 are known to dominate macroscale ferroelectric properties; yet the detailed nature of these defects is currently unknown. Here, the relative stabilities of various defect cluster arrangements of lithium vacancies around a niobium antisite in LiNbO3 are determined using density functional theory combined with thermodynamic calculations. Their effects on the ferroelectricity of the system are also discussed. It is found that at room temperature the non-uniaxial dipole moments associated with the defect clusters could affect the properties of the system locally. The diffusion mechanism is predicted to be through first nearest neighbor jumps on the Li sublattice. The diffusivity of the lithium vacancy is found to be extremely low at room temperature, which indicates that the defect complexes should be rather stable.",
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Structure and diffusion of intrinsic defect complexes in LiNbO3 from density functional theory calculations. / Xu, Haixuan; Lee, Donghwa; Sinnott, Susan B.; Dierolf, Volkmar; Gopalan, Venkatraman; Phillpot, Simon R.

In: Journal of Physics Condensed Matter, Vol. 22, No. 13, 135002, 26.03.2010.

Research output: Contribution to journalArticle

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AU - Xu, Haixuan

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AU - Sinnott, Susan B.

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AU - Phillpot, Simon R.

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AB - Organized defect clusters in non-stoichiometric LiNbO3 are known to dominate macroscale ferroelectric properties; yet the detailed nature of these defects is currently unknown. Here, the relative stabilities of various defect cluster arrangements of lithium vacancies around a niobium antisite in LiNbO3 are determined using density functional theory combined with thermodynamic calculations. Their effects on the ferroelectricity of the system are also discussed. It is found that at room temperature the non-uniaxial dipole moments associated with the defect clusters could affect the properties of the system locally. The diffusion mechanism is predicted to be through first nearest neighbor jumps on the Li sublattice. The diffusivity of the lithium vacancy is found to be extremely low at room temperature, which indicates that the defect complexes should be rather stable.

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