Oxygen diffusivity and defect transport in pure and Yb doped nano-crystalline ceria

Laxmikant Saraf, V. Shutthanandan, S. Thevuthasan, C. M. Wang, K. T. Koch, J. A. Andreasen, O. Marina, Y. Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Oxygen ( 18O) diffusivity in sol-gel synthesized nano-crystalline ceria films of average grain size of 3 nm and 7 nm, annealed at 300°C and 450°C for one hour respectively is examined by nuclear reaction analysis (NRA). Diffusivity and electrical transport properties measured by a. c. impedance spectroscopy were compared with microcrystalline ceria film of average grain size 38 nm annealed at 900°C for one hour. Effect of enhanced oxygen diffusion along with reduced ionic transport in nano-crystalline ceria and reduced oxygen diffusion along with enhanced ionic transport in microcrystalline ceria are correlated to long range ordering, grain boundary scattering and defect density. Enhancement in the conductivity with reduction in activation energy from 1 eV to 0.5 eV in the case 4 atom% ytterbium (Yb) doped ceria compared to pure ceria is a result of increased oxygen vacancies taking part in the defect transport.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsS. Komarneni, J.C. Parker, J.J. Watkins
Pages115-120
Number of pages6
Volume788
Publication statusPublished - 2003
Externally publishedYes
EventContinuous Nanophase and Nanostructured Materials - Boston, MA., United States
Duration: 1 Dec 20035 Dec 2003

Other

OtherContinuous Nanophase and Nanostructured Materials
CountryUnited States
CityBoston, MA.
Period1/12/035/12/03

Fingerprint

Ytterbium
Cerium compounds
Oxygen
Crystalline materials
Defects
Nuclear reactions
Defect density
Oxygen vacancies
Transport properties
Sol-gels
Grain boundaries
Activation energy
Spectroscopy
Scattering
Atoms

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Saraf, L., Shutthanandan, V., Thevuthasan, S., Wang, C. M., Koch, K. T., Andreasen, J. A., ... Zhang, Y. (2003). Oxygen diffusivity and defect transport in pure and Yb doped nano-crystalline ceria. In S. Komarneni, J. C. Parker, & J. J. Watkins (Eds.), Materials Research Society Symposium - Proceedings (Vol. 788, pp. 115-120)

Oxygen diffusivity and defect transport in pure and Yb doped nano-crystalline ceria. / Saraf, Laxmikant; Shutthanandan, V.; Thevuthasan, S.; Wang, C. M.; Koch, K. T.; Andreasen, J. A.; Marina, O.; Zhang, Y.

Materials Research Society Symposium - Proceedings. ed. / S. Komarneni; J.C. Parker; J.J. Watkins. Vol. 788 2003. p. 115-120.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Saraf, L, Shutthanandan, V, Thevuthasan, S, Wang, CM, Koch, KT, Andreasen, JA, Marina, O & Zhang, Y 2003, Oxygen diffusivity and defect transport in pure and Yb doped nano-crystalline ceria. in S Komarneni, JC Parker & JJ Watkins (eds), Materials Research Society Symposium - Proceedings. vol. 788, pp. 115-120, Continuous Nanophase and Nanostructured Materials, Boston, MA., United States, 1/12/03.
Saraf L, Shutthanandan V, Thevuthasan S, Wang CM, Koch KT, Andreasen JA et al. Oxygen diffusivity and defect transport in pure and Yb doped nano-crystalline ceria. In Komarneni S, Parker JC, Watkins JJ, editors, Materials Research Society Symposium - Proceedings. Vol. 788. 2003. p. 115-120
Saraf, Laxmikant ; Shutthanandan, V. ; Thevuthasan, S. ; Wang, C. M. ; Koch, K. T. ; Andreasen, J. A. ; Marina, O. ; Zhang, Y. / Oxygen diffusivity and defect transport in pure and Yb doped nano-crystalline ceria. Materials Research Society Symposium - Proceedings. editor / S. Komarneni ; J.C. Parker ; J.J. Watkins. Vol. 788 2003. pp. 115-120
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