以SrCO_3、TiO_2、Y_2O_3、CeO_2及Gd_2O_3为原料,用传统固相烧结法在不同温度下制备了一系列比例(体积比)的Y_0.08Sr_0.92TiO_(3+δ)/Gd_0.2Ce_0.8O_1.9(CGO)双相复合混合导体材料.用Archimedes法、SEM 、XRD、 EIS等手段对材料的致密度、微观结构、化学相容性及导电性能进行了研究.结果表明,1600 ℃烧结的40% (体积分数, 下同)YST/60% CGO的试样相对体密度达到了99%,未发生相转变,化学相容性较好且电导率较高.以40%YST/60%CGO的粉体作为混合导体制备极限电流传感器,进行O_2敏感性能测试.结果表明:传感器在氧浓度低于0.1%,温度范围在600～700℃内,极限电流随氧浓度增大而增大,二者具有较好的线性关系.实验证明YST/CGO混合导体材料可以作为限流型氧传感器的扩散阻使用.
Y_0.08Sr_0.92TiO_(3+δ)/Gd_0.2Ce_0.8O_1.9 with different volume ratio were prepared by solid state reaction using SrCO_3, TiO_2, Y_2O_3, CeO_2 and Gd_2O_3 as raw materials. Its density, microstructure, chemical consistence and conductivity were investigated by Archimedes method, SEM, XRD and EIS. The results show that Y_0.08Sr_0.92TiO_(3+δ)/Gd_0.2Ce_0.8O_1.9 sintered at 1600 ℃ exhibited high density and electrical conductivity and good chemical consistence without phase reaction. The prepared powders were used as the gas sensing materials for fabrication of O_2 gas sensor, and its sensing performances were examined. The results show that the Y_0.08Sr_0.92TiO_(3+δ)/Gd_0.2Ce_0.8O_1.9 exhibites high sensitivity, and the EMF of sensor and the O_2 concentration have almost linear correlation. YST/CGO can be used as diffusion barrier for limiting current oxygen sensor.
参考文献
| [1] | Porat O.;Tuller HL.;Heremans C. .STABILITY AND MIXED IONIC ELECTRONIC CONDUCTION IN GD-2(TI1-XMOX)(2)O-7 UNDER ANODIC CONDITIONS[J].Solid state ionics,1997(1/4):75-83. |
| [2] | McEvoy AJ. .Thin SOFC electrolytes and their interfaces - A near-term research strategy [Review][J].Solid state ionics,2000(3/4):159-165. |
| [3] | Riess I. .Mixed ionic-electronic conductors - material properties and applications[J].Solid state ionics,2003(1/4):1-17. |
| [4] | Shaula A et al.[J].Journal of Solid State Electrochemistry,2006,10:28. |
| [5] | Hideto K et al.[J].Journal of Power Sources,2007,164:510. |
| [6] | Cui H et al.[J].Journal of the Electrochemical Society,2005,152:1726. |
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