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Ionic conductivity of nanocrystalline yttria-stabilized zirconia: grain boundary and size effects

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Durá, O. J. and López de la Torre, M. A. and Vázquez, L. and Chaboy, J. and Boada, R. and Rivera Calzada, Alberto Carlos and Santamaría Sánchez-Barriga, Jacobo and León Yebra, Carlos (2010) Ionic conductivity of nanocrystalline yttria-stabilized zirconia: grain boundary and size effects. Physical review B, 81 (18). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.81.184301


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http://journals.aps.org/Publisher


Abstract

We report on the effect of grain size on the ionic conductivity of yttria-stabilized zirconia samples synthesized by ball milling. Complex impedance measurements, as a function of temperature and frequency are performed on 10 mol % yttria-stabilized zirconia nanocrystalline samples with grain sizes ranging from 900 to 17 nm. Bulk ionic conductivity decreases dramatically for grain sizes below 100 nm, although its activation energy is essentially independent of grain size. The results are interpreted in terms of a space-charge layer resulting from segregation of mobile oxygen vacancies to the grain-boundary core. The thickness of this space-charge layer formed at the grain boundaries is on the order of 1 nm for large micron-sized grains but extends up to 7 nm when decreasing the grain size down to 17 nm. This gives rise to oxygen vacancies depletion over a large volume fraction of the grain and consequently to a significant decrease in oxide-ion conductivity.


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© 2010 The American Physical Society. We acknowledge financial support by Junta de Comunidades de Castilla-La Mancha through Project No. PAI-05- 013, by CAM under Grant No. S2009/MAT-1756 Phama, by Spanish MICINN through Grants No. MAT2008-06517- C02, No. MAT2008-06542-C04, and No. FIS2009-12964- C05-04, and Consolider Ingenio 2010 under Grant No. CSD2009-00013 Imagine. We thank J. Garcia-Barriocanal for helpful discussions. We are indebted to the staff of SpLine for their help during the experimental work at ESRF.

Uncontrolled Keywords:Oxide fuel-cells; X-ray-absorption; Electrical-conductivity; Defect chemistry; Solid-solutions; Constant loss; Thin-films; Conductors; Electrolytes; Transport.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:30318
Deposited On:26 May 2015 09:32
Last Modified:10 Dec 2018 14:58

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