Conductividad eléctrica y difusión de oxígeno en el sistema Bifevox

Translated title of the contribution: Electrical conductivity and oxygen diffusion in Bifevox

V. Peña, A. Rivera, García-Barriocanal, C. León, Santamaría, E. García-González, M. González-Calbet

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We present electrical conductivity measurements of BIFEVOX Bi 4V2-xFexO11-y (0≤x≤0.9; 0≤y≤1), in which V (IV) ions have been systematically substituted by Fe (III) ions. Conductivity shows a power law frequency dependence described by the form σ*(ω)= σdc[1+(jω/ωp)n], known as universal dynamic response. Conversely, the electric modulus shows asymmetric peaks, characterized by stretched exponentials relaxation functions in time domain of the form φ(t)=exp(-(t/τ0)β). β is determined by the degree of correlation in the ionic motion. It's value, β=0.56±0.03, is almost independent of temperature and iron content. Increasing Fe content leads to an exponential decrease of the conductivity and to an increase of the activation energy of the conduction process from 0.20 to 0.97 eV. These results are discussed in terms of oxygen vacancy ordering upon Fe (III) substitution.

Translated title of the contributionElectrical conductivity and oxygen diffusion in Bifevox
Original languageSpanish
Pages (from-to)67-70
Number of pages4
JournalBoletin de la Sociedad Espanola de Ceramica y Vidrio
Volume43
Issue number1
DOIs
StatePublished - 2004

Keywords

  • Impedance spectroscopy
  • Ionic conductor
  • Ionic correlation
  • Oxygen diffusion

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