Enhanced electronic conductivity in Si-substituted calcium aluminate

Mariana I. Bertoni; Thomas O. Mason; Julia E. Medvedeva; Yongqiang Wang; Arthur J. Freeman; Kenneth R. Poeppelmeier

doi:10.1063/1.2817605

Enhanced electronic conductivity in Si-substituted calcium aluminate

Mariana I. Bertoni, Thomas O. Mason, Julia E. Medvedeva^*, Yongqiang Wang, Arthur J. Freeman, Kenneth R. Poeppelmeier

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Improved conductivity has been achieved by controllable substitution of an ultraviolet electronic conductor. The transparent conducting oxide system, H-doped Ca12 Al (14-x) Six O (33+ x/2) with x=0-4, exhibits a conductivity strongly dependent on the substitution level. Four-point direct current conductivity increases with x from 0.15 to 0.61 S/cm at room temperature. The observed conductivity behavior is consistent with the predictions of our first principles density functional calculations for the Si-substituted system with x=0, 2, and 4. Furthermore, the Seebeck coefficient is composition dependent suggesting the existence of an activated mobility associated with small polaron conduction.

Original language	English (US)
Article number	113704
Journal	Journal of Applied Physics
Volume	102
Issue number	11
DOIs	https://doi.org/10.1063/1.2817605
State	Published - 2007

Funding

This work was supported by the MRSEC program of the National Science Foundation at Northwestern University (DMR-0076097), by the Department of Energy (DE-FG02-88ER45372), and by the University of Missouri Research Board.

ASJC Scopus subject areas

General Physics and Astronomy

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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abstract = "Improved conductivity has been achieved by controllable substitution of an ultraviolet electronic conductor. The transparent conducting oxide system, H-doped Ca12 Al (14-x) Six O (33+ x/2) with x=0-4, exhibits a conductivity strongly dependent on the substitution level. Four-point direct current conductivity increases with x from 0.15 to 0.61 S/cm at room temperature. The observed conductivity behavior is consistent with the predictions of our first principles density functional calculations for the Si-substituted system with x=0, 2, and 4. Furthermore, the Seebeck coefficient is composition dependent suggesting the existence of an activated mobility associated with small polaron conduction.",

author = "Bertoni, {Mariana I.} and Mason, {Thomas O.} and Medvedeva, {Julia E.} and Yongqiang Wang and Freeman, {Arthur J.} and Poeppelmeier, {Kenneth R.}",

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doi = "10.1063/1.2817605",

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AU - Bertoni, Mariana I.

AU - Mason, Thomas O.

AU - Medvedeva, Julia E.

AU - Wang, Yongqiang

AU - Freeman, Arthur J.

AU - Poeppelmeier, Kenneth R.

N1 - Funding Information: This work was supported by the MRSEC program of the National Science Foundation at Northwestern University (DMR-0076097), by the Department of Energy (DE-FG02-88ER45372), and by the University of Missouri Research Board.

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N2 - Improved conductivity has been achieved by controllable substitution of an ultraviolet electronic conductor. The transparent conducting oxide system, H-doped Ca12 Al (14-x) Six O (33+ x/2) with x=0-4, exhibits a conductivity strongly dependent on the substitution level. Four-point direct current conductivity increases with x from 0.15 to 0.61 S/cm at room temperature. The observed conductivity behavior is consistent with the predictions of our first principles density functional calculations for the Si-substituted system with x=0, 2, and 4. Furthermore, the Seebeck coefficient is composition dependent suggesting the existence of an activated mobility associated with small polaron conduction.

AB - Improved conductivity has been achieved by controllable substitution of an ultraviolet electronic conductor. The transparent conducting oxide system, H-doped Ca12 Al (14-x) Six O (33+ x/2) with x=0-4, exhibits a conductivity strongly dependent on the substitution level. Four-point direct current conductivity increases with x from 0.15 to 0.61 S/cm at room temperature. The observed conductivity behavior is consistent with the predictions of our first principles density functional calculations for the Si-substituted system with x=0, 2, and 4. Furthermore, the Seebeck coefficient is composition dependent suggesting the existence of an activated mobility associated with small polaron conduction.

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Enhanced electronic conductivity in Si-substituted calcium aluminate

Abstract

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