Fabrication and Conductivity of La9.33Si6O26-based Composite Oxygen-ionic Conductor

doi:10.3724/SP.J.1077.2011.01043

Abstract

Abstract: The oxygen-ionic conductor of La_9.33Si₆O₂₆-10wt% Zr_0.86Y_0.14O_1.92 composite material was prepared by using a modified co-precipitation method. X-ray diffraction, scanning electron microscope and complex impedance were adopted to investigate the phase component, microstructures and conductivities of the composite material, respectively. The results show that the average grain size of the as-calcined powder is 35 nm and the average particle size of the as-sintered composite ceramic is about 500 nm. The conductivities of the composite ceramic are higher than those of the single phase La_9.33Si₆O₂₆ and Zr_0.86Y_0.14O_1.92 ceramic at the temperatures from 300℃ to 700℃. The conductivity of the composite ceramic is one order in magnitude higher than that of polycrystalline La_9.33Si₆O₂₆ at 700℃. The conduction mechanism of the composite material is discussed by the analysis of impedance spectra and electric modulus spectra.

Key words: La_9.33Si₆O₂₆, Zr_0.86Y_0.14O_1.92, composite material, co-precipitation method, ionic conductivity

CLC Number:

TB332

LIU Chao-Feng, ZHANG Hong, XIA Jun-Xiao, Li Gen, LI Zhi-Cheng. Fabrication and Conductivity of La_9.33Si₆O₂₆-based Composite Oxygen-ionic Conductor[J]. Journal of Inorganic Materials, 2011, 26(10): 1043-1048.

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Fabrication and Conductivity of La_9.33Si₆O₂₆-based Composite Oxygen-ionic Conductor

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