Research Papers

Dopant Clustering and Correlated Oxygen Migration in Conditionally Stabilized Zirconia Electrolytes

[+] Author and Article Information
Steven P. Miller

Naval Ship Systems Engineering Station,
5001 South Broad Street,
Philadelphia, PA 19112
e-mail: steven.p.miller3@navy.mil

Brett I. Dunlap

Naval Research Laboratory,
4555 Overlook Avenue SW,
Washington, DC 20375
e-mail: brett.dunlap@nrl.navy.mil

Amy S. Fleischer

Department of Mechanical Engineering,
Villanova University,
800 Lancaster Avenue,
Villanova, PA 19085
e-mail: amy.fleischer@villanova.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received August 8, 2014; final manuscript received October 30, 2014; published online December 17, 2014. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 12(2), 021003 (Apr 01, 2015) (6 pages) Paper No: FC-14-1097; doi: 10.1115/1.4029082 History: Received August 08, 2014; Revised October 30, 2014; Online December 17, 2014

Molecular dynamics (MD) simulation of yttria/scandia-stabilized zirconia (SSZ) with variably distributed Y/Sc dopant ions shows that energy is minimized when the dopants are uniformly spread apart, provided that the lattice maintains cubic fluorite symmetry. In contrast, highly clustered dopants are found to destabilize the cubic phase due to the presence of large regions of dopant-free zirconia. Computed oxygen diffusion coefficients and conductivity values consistently show that the Haven ratio is always less than one, indicating that correlation effects influence the motion of oxygen ions and vacancies. In addition, it is seen that the conductivity of crystals with noncubic symmetry is markedly anisotropic.

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Grahic Jump Location
Fig. 1

Supercell images of annealed (left) and randomized (right) specimens of MSZ-2/9. Despite the differences in dopant and vacancy arrangements, both specimens maintain the Fm3m lattice arrangement of cubic zirconia. However, there is greater ordering of dopants in the annealed specimen, which can be observed in the patterns of the smaller light and dark cations, representing scandium and yttrium ions, respectively.




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