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 | |
| Publication status | Published - 28 Mar 2005 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
Cite this
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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TY - JOUR
T1 - Nanoscale effects on ion conductance of layer-by-layer structures of gadolinia-doped ceria and zirconia
AU - Azad, S.
AU - Marina, O. A.
AU - Wang, C. M.
AU - Saraf, L.
AU - Shutthanandan, V.
AU - McCready, D. E.
AU - El-Azab, A.
AU - Jaffe, J. E.
AU - Engelhard, M. H.
AU - Peden, C. H F
AU - Thevuthasan, S.
PY - 2005/3/28
Y1 - 2005/3/28
N2 - 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.
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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UR - http://www.scopus.com/inward/citedby.url?scp=20244377691&partnerID=8YFLogxK
U2 - 10.1063/1.1894615
DO - 10.1063/1.1894615
M3 - Article
VL - 86
SP - 1
EP - 3
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 13
M1 - 131906
ER -