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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
STEELE B C H. Fuel-cell technology: Running on natural gas [J]. Nature, 1999, 400(6861): 619–621.
MINH N Q. Solid oxide fuel cell technology-features and applications [J]. Solid State Ionics, 2004, 174(1/4): 271–277.
ZHOU Hai-tao, ZHANG Hong, LI Zhi-cheng. Preparation and conductivity of the nano-composite La9.33Si6O26/Ce0.85Bi0.15O1.925 oxygen ionic conductor [J]. Journal of Central South University: Science and Technology, 2009, 40(5): 1265–1269. (in Chinese)
GARCIA-BARRIOCANAL J, RIVERA-CALZADA A, VARELA M, SEFRIOUI Z, IBORRA E, LEON C, PENNYCOOK S J, SABTAMARIA J. Colossal ionic conductivity at interfaces of epitaxial ZrO2:Y2O3/SrTiO3 heterostructures [J]. Science, 2008, 321(5889): 676–680.
AZAD S, MARINA O A, WANG C M, SARAF L, SHUTTHANANDAN V, MCCREADY D E, EL-AZAB A, JAFFE J E, ENGELHARD M H, PEDEN C H F, THEVUTHASAN S. Nanoscale effects on ion conductance of layer-by-layer structures of gadolinia-doped ceria and zirconia [J]. Applied Physics Letters, 2005, 86(13): 131906–8.
WANG C M, ENGELHARD H M, AZAD S, SARAF L V, MCDREADY D E, SHUTTHANANDAN V, YU Z Q, THEVUTHASAN S, WATANABE M, WILLIAMS D B. Distribution of oxygen vacancies and gadolinium dopants in ZrO2-CeO2 multi-layer films grown on α-Al2O3 [J]. Solid State Ionics, 2006, 177(15/16): 1299–1306.
ZHANG Hong, ZHANG Zhe, MA Guo-qiang, ZHANG Yu-xing, LI Zhi-cheng. Coprecipitation synthesis and oxide ionic on ductivities of Ce0.8Sm0.2O1.9-based nanocomposite materials [J]. Journal Inorganic Materials, 2009, 24(2): 353–356. (in Chinese)
XIA Jun-xiao, ZHANG Hong, LI Ya-ling, LIU Chao-feng, LI Zhi-cheng. Preparation and conductivities of Ce0.8Sm0.2O1.9-La0.9Sr0.1Ga0.8Mg0.2O2.85 composite materials [J]. Journal of Central South University: Science and Technology, (accepted). (in Chinese)
MIZUTANI Y, TAMURA M, KAWAI M. Development of high-performance electrolyte in SOFC [J]. Solid State Ionics, 1994, 72(2): 271–275.
WANG Qi-gen, PENG Ran-ran, XIA Chang-rong, ZHU Wei, WANG Huan-ting. Characteristics of YSZ synthesized with a glycine-nitrate process [J]. Ceramics International, 2008, 34(7): 1773–1778.
SHAULA A L, KHARTON V V, WAERENBORGH J C, ROJAS D P, MARQUES F M B. Oxygen ionic and electronic transport in apatite ceramics [J]. Journal of the European Ceramic Society, 2005, 25(12): 2583–2586.
ZHANG Hong, LI Zhi-cheng, BERGMAN B, ZOU Xiao-dong. Investigation of La9.33Si6O26 oxygen ionic conductor [J]. Journal of Materials Science and Technology, 2007, 23(5): 629–632.
BECHADE E, JULIEN I, IWATA T, MASSON O, THOMAS P, CHAMPION E, FUKUDA K. Synthesis of lanthanum silicate oxyapatite materials as a solid oxide fuel cell electrolyte [J]. Journal of the European Ceramic Society, 2008, 28(14): 2717–2724.
TIAN C G, LIU J L, CAI J, ZENG Y W. Direct synthesis of La9.33Si6O26 ultrafine powder via sol-gel self-combustion method [J]. Journal of Alloys and Compounds, 2008, 458(1/2): 378–382.
BANERJEE S, DEVI P S, TOPWAL D, MANDAL S, MENON K. Enhanced ionic conductivity in Ce0.8Sm0.2O1.9: Unique effect of calcium co-doping [J]. Advanced Functional Materials, 2007, 17(15): 2847–2854.
GERHARDT R. Impedance and dielectric spectroscopy revisited: Distinguishing localized relaxation from long-range conductivity [J]. Journal of Physics and Chemistry of Solids, 1994, 55(12): 1491–1506.
Author information
Authors and Affiliations
Corresponding author
Additional information
Foundation item: Project(50872155) supported by the National Natural Science Foundation of China
Rights and permissions
About this article
Cite this article
Liu, Cf., Zhang, H., Zhang, Z. et al. Fabrication and characterization of composite YSZ-La9.33Si6O26 oxygen-ion conductor. J. Cent. South Univ. Technol. 19, 22–29 (2012). https://doi.org/10.1007/s11771-012-0967-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11771-012-0967-8