Fabrication and characterization of composite YSZ-La9.33Si6O26 oxygen-ion conductor |
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| Authors: | Chao-feng Liu Hong Zhang Zhe Zhang Jun-xiao Xia and Zhi-cheng Li |
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| Affiliation: | [1]School of Materials Science and Engineering, Central South University, Changsha 410083, China [2]State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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| Abstract: | To improve the conductivity of Y2O3-stabilized ZrO2 (YSZ) based oxygen-ion conductor, Zr0.85Y0.15O1.925-La9.33Si6O26 (YSZ-LSO) composite ceramics with the mass fraction of La9.33Si6O26 (LSO) of 15% were prepared by using a modified coprecipitation method. The phases, microstructures and conductivities of
the YSZ, LSO and YSZ-LSO were investigated by X-ray diffraction, electron microscopy and complex impedance, respectively.
The results show that the as-calcined powder of YSZ-LSO composite has the grain size less than 10 nm, and the as-sintered
composite ceramics are composed of YSZ and LSO phases. The conductivity can be enhanced obviously by composite method. At
700 °C, the conductivity of the composite ceramic is 0.125 S/cm, which is one order in magnitude higher than that of the YSZ
ceramic and two orders in magnitude higher than that of LSO ceramic. By analyzing the impedance spectra and modulus spectra,
the interfacial effect on the conductivity improvement was proposed. |
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| Keywords: | oxygen-ion conductor composite materials coprecipitation synthesis conductivity |
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