La0.6Sr0.4Co1-yFeyO3的混合导电性研究

无机材料学报

La_0.6Sr_0.4Co_1-yFe_yO₃的混合导电性研究

黄端平¹, 徐庆^1,2, 陈文^1,2, 王皓², 袁润章²

1. 武汉理工大学材料科学与工程学院; 2. 材料复合新技术国家重点实验室, 武汉 430070

收稿日期:2003-11-24 修回日期:2003-12-22 出版日期:2005-01-20 网络出版日期:2005-01-20

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

HUANG Duan-Ping^1, XU Qing^1,2, CHEN Wen^1,2, WANG Hao², YUAN Run-Zhang²

1. School of Materials Science and Engineering; 2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,
Wuhan University of Technology, Wuhan 430070, China

Received:2003-11-24 Revised:2003-12-22 Published:2005-01-20 Online:2005-01-20

摘要/Abstract

摘要： 采用直流四探针法和两端子电子阻塞电极交流阻抗谱研究了GNP法制备La_0.6Sr_0.4Co_1-yFe_yO₃陶瓷的电子-离子混合导电性能. 在室温～900℃范围内, La_0.6Sr_0.4CoO₃的电子电导率随温度的升高而单调降低, 其它样品的电子电导率随温度的升高在600℃附近达到最大值. La_0.6Sr_0.4Co_1-yFe_yO₃陶瓷的氧离子电导率随温度的升高而增加. 在相同温度下, 随着Co/Fe比例的增加, La_0.6Sr_0.4Co_1-yFe_yO₃陶瓷的电子电导率和氧离子电导率增加, 电子导电活化能和离子导电活化能降低. 氧离子迁移数随温度的升高而增加, 随Co/Fe比例的增加而降低.

关键词: La_0.6Sr_0.4Co_1-yFe_yO₃, 钙钛矿复合氧化物, 电子电导率, 离子电导率

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

中图分类号:

TQ174

黄端平,徐庆,陈文,王皓,袁润章. La_0.6Sr_0.4Co_1-yFe_yO₃的混合导电性研究[J]. 无机材料学报.

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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La_0.6Sr_0.4Co_1-yFe_yO₃的混合导电性研究

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

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