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Grain–bulk versus grain–boundary sensitivities to redox reaction in yttria-doped ceria ceramics viewed from impedance spectroscopy

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Abstract

Yttria-doped ceria ceramics were prepared and reduced in an oxygen-deficient (argon) ambient. Electrical characterization through impedance spectroscopy revealed ionic-type conduction processes in as-sintered samples, with grain–bulk and grain–boundary activation energies (H) of about 1.00 eV and 1.05 eV, respectively. Electrical results from the reduced materials showed a predominant electronic-type, relatively high conductivity for the grains (H=0.52 eV), in contrast to a still ionic-like, relatively poor conductivity for the grain boundaries (H=0.95 eV). With the support of the results processed after re-oxidizing the materials in air combined with information from literature, this apparently contradictory behavior is discussed in terms of electron trapping at (Ce3+:\(V_{\text{O}^{..}}\))-type defect complexes. The overall work strongly supports the idea that surfaces (e.g., grain boundaries) in polycrystalline ceria are indeed much more sensitive to redox interactions than lattice.

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Authors and Affiliations

  1. Instituto de Física de São Carlos (IFSC), Universidade de São Paulo (USP), C. Postal 369, CEP 13560-970, São Carlos, SP, Brazil

    J.-C. M’Peko & M.F. De Souza

  2. Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos (UFSCar), C. Postal 676, CEP 13565-905, São Carlos, SP, Brazil

    C.L. Da Silva & D.P.F. De Souza

Authors
  1. J.-C. M’Peko
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  2. M.F. De Souza
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  3. C.L. Da Silva
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  4. D.P.F. De Souza
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Correspondence to J.-C. M’Peko.

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PACS

72.20.-i; 72.60.+g; 72.80.-r

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M’Peko, JC., De Souza, M., Da Silva, C. et al. Grain–bulk versus grain–boundary sensitivities to redox reaction in yttria-doped ceria ceramics viewed from impedance spectroscopy. Appl. Phys. A 89, 509–515 (2007). https://doi.org/10.1007/s00339-007-4096-4

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  • DOI: https://doi.org/10.1007/s00339-007-4096-4

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