Synthesis and characterization of Zr_(0.85)Y_(0.15)O_(1.925)-La_(9.33)Si_(6)O_(26) composite electrolyte for application in SOFCs  

作　　者：Chaofeng LIU Hong ZHANG Junxiao XIA Zhicheng LI 

机构地区：[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

出　　处：《Journal of Advanced Ceramics》2012年第4期327-335,共9页先进陶瓷（英文）

基　　金：the National Nature Science Foundation of China(Nos.50872155 and 51172287)。

摘　　要：Composite oxide ionic conductors consisting of Zr_(0.85)Y_(0.15)O_(1.925)(YSZ)and La_(9.33)Si_(6)O_(26)(LSO)have been synthesized by a modified coprecipitation method.X-ray diffraction,electron microscope,and complex impedance were adopted to investigate the phase component,microstructures,and conductivities,respectively.The results show that the average grain sizes of the composite powders and as-sintered pellets are less than 20 nm and 200 nm,respectively.The conductivity of the composite materials composed of 94 wt%YSZ and 6 wt%LSO is 0.215 S/cm at 700℃.The conductivity of the composite is three times higher than that of the polycrystalline YSZ and has two orders in magnitude higher than that of the polycrystalline LSO at 700℃.By analyzing the impedance spectra and modulus spectra,the grain-boundary effect on the conductivity improvement is investigated and the conductive mechanisms of the composite materials are discussed.

关 键 词：Zr_(0.85)Y_(0.15)O_(1.925) La_(9.33)Si_(6)O_(26) composite materials coprecipitation synthesis oxygen ionic conductivity 

分 类 号：TB3[一般工业技术—材料科学与工程]