Mixed Electronic-ionic Conductivity of La0.6Sr0.4Co1-yFeyO3 Perovskite-type Oxides

Abstract

Abstract: La_0.6Sr_0.4Co_1-yFe_yO₃ complex oxide powders were synthesized by a glycine-nitrate process(GNP). The electrical conductivities and the oxygen ionic conductivities of
La_0.6Sr_0.4Co_1-yFe_yO₃ ceramics were investigated by DC four-terminal method and AC impedance spectroscopy using two-terminal blocking
electrodes, respectively. The equivalent circuits for AC impedance spectra were ascertained with respect to measuring temperature. The electrical
conductivity of La_0.6Sr_0.4CoO₃ decreased monotonously with the increase of temperature from room temperature to 900℃,
while the electrical conductivities of other compositions increased with temperature through the maximum near 600℃ and then decreased.
The ionic conductivities of La_0.6Sr_0.4Co_1-yFe_yO₃ ceramics increased with temperature within the whole measuring temperature range. The electrical conductivities
and the ionic conductivities of La_0.6Sr_0.4Co_1-yFe_yO₃ ceramics enhanced with the increase of Co/Fe ratio under the same measuring temperature.
The activation energies for electronic conduction and the activation energies for oxygen ionic conduction of La_0.6Sr_0.4Co_1-yFe_yO₃
ceramics decreased with the increase of Co/Fe ratio. The ionic transport numbers of La_0.6Sr_0.4Co_1-yFe_yO₃ increased with the increase of
temperature and decreased with the increase of Co/Fe ratio at an identical temperature. La_0.6Sr_0.4Co_1-yFe_yO₃ ceramics exhibited the ionic
conductivities of 4.0×10^-2～6.5×10^-2S·cm^-1 and the ionic transport numbers of 4.6×10^-5～1.5×10^-4 at 800℃.

Key words: La_0.6Sr_0.4Co_1-yFe_yO₃, perovskite-type oxides, electronic conductivity, ionic conductivity

CLC Number:

TQ174

HUANG Duan-Ping,XU Qing,CHEN Wen,WANG Hao,YUAN Run-Zhang. Mixed Electronic-ionic Conductivity of La_0.6Sr_0.4Co_1-yFe_yO₃ Perovskite-type Oxides[J]. Journal of Inorganic Materials.

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Mixed Electronic-ionic Conductivity of La_0.6Sr_0.4Co_1-yFe_yO₃ Perovskite-type Oxides

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