Nanoscale effects on ion conductance of layer-by-layer structures of gadolinia-doped ceria and zirconia

S. Azad; O. A. Marina; C. M. Wang; L. Saraf; V. Shutthanandan; D. E. McCready; A. El-Azab; J. E. Jaffe; M. H. Engelhard; C. H.F. Peden; S. Thevuthasan

doi:10.1063/1.1894615

Nanoscale effects on ion conductance of layer-by-layer structures of gadolinia-doped ceria and zirconia

S. Azad, O. A. Marina, C. M. Wang, L. Saraf, V. Shutthanandan, D. E. McCready, A. El-Azab, J. E. Jaffe, M. H. Engelhard, C. H.F. Peden, S. Thevuthasan

Research output: Contribution to journal › Article

154 Citations (Scopus)

Abstract

Layer-by-layer structures of gadolinia-doped ceria and zirconia have been synthesized on Al2 O3 (0001) using oxygen plasma-assisted molecular beam epitaxy. Oxygen ion conductivity greatly increased with an increasing number of layers compared to bulk polycrystalline yttria-stabilized zirconia and gadolinia-doped ceria electrolytes. The conductivity enhancement in this layered electrolyte is interesting, yet the exact cause for the enhancement remains unknown. For example, the space charge effects that are responsible for analogous conductivity increases in undoped layered halides are suppressed by the much shorter Debye screening length in layered oxides. Therefore, it appears that a combination of lattice strain and extended defects due to lattice mismatch between the heterogeneous structures may contribute to the enhancement of oxygen ionic conductivity in this layered oxide system.

Original language	English
Article number	131906
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	13
DOIs	https://doi.org/10.1063/1.1894615
Publication status	Published - 28 Mar 2005

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ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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Azad, S., Marina, O. A., Wang, C. M., Saraf, L., Shutthanandan, V., McCready, D. E., El-Azab, A., Jaffe, J. E., Engelhard, M. H., Peden, C. H. F., & Thevuthasan, S. (2005). Nanoscale effects on ion conductance of layer-by-layer structures of gadolinia-doped ceria and zirconia. Applied Physics Letters, 86(13), 1-3. [131906]. https://doi.org/10.1063/1.1894615

Nanoscale effects on ion conductance of layer-by-layer structures of gadolinia-doped ceria and zirconia. / Azad, S.; Marina, O. A.; Wang, C. M.; Saraf, L.; Shutthanandan, V.; McCready, D. E.; El-Azab, A.; Jaffe, J. E.; Engelhard, M. H.; Peden, C. H.F.; Thevuthasan, S.

In: Applied Physics Letters, Vol. 86, No. 13, 131906, 28.03.2005, p. 1-3.

Research output: Contribution to journal › Article

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abstract = "Layer-by-layer structures of gadolinia-doped ceria and zirconia have been synthesized on Al2 O3 (0001) using oxygen plasma-assisted molecular beam epitaxy. Oxygen ion conductivity greatly increased with an increasing number of layers compared to bulk polycrystalline yttria-stabilized zirconia and gadolinia-doped ceria electrolytes. The conductivity enhancement in this layered electrolyte is interesting, yet the exact cause for the enhancement remains unknown. For example, the space charge effects that are responsible for analogous conductivity increases in undoped layered halides are suppressed by the much shorter Debye screening length in layered oxides. Therefore, it appears that a combination of lattice strain and extended defects due to lattice mismatch between the heterogeneous structures may contribute to the enhancement of oxygen ionic conductivity in this layered oxide system.",

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AU - Shutthanandan, V.

AU - McCready, D. E.

AU - El-Azab, A.

AU - Jaffe, J. E.

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AU - Peden, C. H.F.

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AB - Layer-by-layer structures of gadolinia-doped ceria and zirconia have been synthesized on Al2 O3 (0001) using oxygen plasma-assisted molecular beam epitaxy. Oxygen ion conductivity greatly increased with an increasing number of layers compared to bulk polycrystalline yttria-stabilized zirconia and gadolinia-doped ceria electrolytes. The conductivity enhancement in this layered electrolyte is interesting, yet the exact cause for the enhancement remains unknown. For example, the space charge effects that are responsible for analogous conductivity increases in undoped layered halides are suppressed by the much shorter Debye screening length in layered oxides. Therefore, it appears that a combination of lattice strain and extended defects due to lattice mismatch between the heterogeneous structures may contribute to the enhancement of oxygen ionic conductivity in this layered oxide system.

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10.1063/1.1894615