TY - JOUR
T1 - Conductividad eléctrica y difusión de oxígeno en el sistema Bifevox
AU - Peña, V.
AU - Rivera, A.
AU - García-Barriocanal,
AU - León, C.
AU - Santamaría,
AU - García-González, E.
AU - González-Calbet, M.
PY - 2004
Y1 - 2004
N2 - 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.
AB - 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.
KW - Impedance spectroscopy
KW - Ionic conductor
KW - Ionic correlation
KW - Oxygen diffusion
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U2 - 10.3989/cyv.2004.v43.i1.620
DO - 10.3989/cyv.2004.v43.i1.620
M3 - Article
AN - SCOPUS:33744727120
SN - 0366-3175
VL - 43
SP - 67
EP - 70
JO - Boletin de la Sociedad Espanola de Ceramica y Vidrio
JF - Boletin de la Sociedad Espanola de Ceramica y Vidrio
IS - 1
ER -