Structural evolution across the insulator-metal transition in oxygen-deficient BaTiO3-δ studied using neutron total scattering and Rietveld analysis
Abstract
Oxygen-deficient BaTiO3-δ exhibits an insulator-metal transition with increasing δ. We performed neutron total scattering measurements to study structural evolution across an insulator-metal transition in BaTiO3-δ. Despite its significant impact on resistivity, slight oxygen reduction (δ=0.09) caused only a small disturbance on the local doublet splitting of Ti-O bond. This finding implies that local polarization is well preserved under marginal electric conduction. In the highly oxygen-deficient metallic state (δ=0.25), however, doublet splitting of the Ti-O bond became smeared. The smearing of the local Ti-O doublet is complemented with long-range structural analysis and demonstrates that the metallic conduction in the highly oxygen-reduced BaTiO3-δ is due to the appearance of nonferroelectric cubic lattice.
- Authors:
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1100663
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 84 Journal Issue: 6; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Jeong, I.-K., Lee, Seunghun, Jeong, Se-Young, Won, C. J., Hur, N., and Llobet, A. Structural evolution across the insulator-metal transition in oxygen-deficient BaTiO3-δ studied using neutron total scattering and Rietveld analysis. United States: N. p., 2011.
Web. doi:10.1103/PhysRevB.84.064125.
Jeong, I.-K., Lee, Seunghun, Jeong, Se-Young, Won, C. J., Hur, N., & Llobet, A. Structural evolution across the insulator-metal transition in oxygen-deficient BaTiO3-δ studied using neutron total scattering and Rietveld analysis. United States. https://doi.org/10.1103/PhysRevB.84.064125
Jeong, I.-K., Lee, Seunghun, Jeong, Se-Young, Won, C. J., Hur, N., and Llobet, A. Mon .
"Structural evolution across the insulator-metal transition in oxygen-deficient BaTiO3-δ studied using neutron total scattering and Rietveld analysis". United States. https://doi.org/10.1103/PhysRevB.84.064125.
@article{osti_1100663,
title = {Structural evolution across the insulator-metal transition in oxygen-deficient BaTiO3-δ studied using neutron total scattering and Rietveld analysis},
author = {Jeong, I.-K. and Lee, Seunghun and Jeong, Se-Young and Won, C. J. and Hur, N. and Llobet, A.},
abstractNote = {Oxygen-deficient BaTiO3-δ exhibits an insulator-metal transition with increasing δ. We performed neutron total scattering measurements to study structural evolution across an insulator-metal transition in BaTiO3-δ. Despite its significant impact on resistivity, slight oxygen reduction (δ=0.09) caused only a small disturbance on the local doublet splitting of Ti-O bond. This finding implies that local polarization is well preserved under marginal electric conduction. In the highly oxygen-deficient metallic state (δ=0.25), however, doublet splitting of the Ti-O bond became smeared. The smearing of the local Ti-O doublet is complemented with long-range structural analysis and demonstrates that the metallic conduction in the highly oxygen-reduced BaTiO3-δ is due to the appearance of nonferroelectric cubic lattice.},
doi = {10.1103/PhysRevB.84.064125},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 6,
volume = 84,
place = {United States},
year = {Mon Aug 29 00:00:00 EDT 2011},
month = {Mon Aug 29 00:00:00 EDT 2011}
}
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