氧化钆掺杂纳米氧化铈薄膜的制备与烧结性能研究  

Fabrication and low temperature sintering of GDC thin film

作　　者：梁金[1] 朱庆山[2] 

机构地区：[1]中南林业科技大学材料科学与工程学院,湖南长沙410004 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100080

出　　处：《功能材料》2008年第2期275-278,共4页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2003AA323010);中南林业科技大学新进高层次人才资助项目(101-0623)

摘　　要：以Ce(NO3)3.6H2O和Gd2O3为前驱体,六亚甲基四胺为沉淀剂,通过均相沉淀反应直接合成能长时间稳定悬浮的氧化钆掺杂纳米氧化铈(Ce0.8Gd0.2O1.9,GDC)母液。对合成的前驱粉体进行了XRD、BET、动态光散射等研究,XRD结果表明粉体具有氧化铈的立方萤石结构特征峰,BET结果表明粉体比表面积为68.3m2/g,当量粒径为约12nm,非等温烧结实验结果表明粉体具有良好的烧结活性。用浸渍-提拉法(dip-coating)在多孔NiO-YSZ阳极基底上制备GDC电解质薄膜,并利用场发射扫描电镜对薄膜的烧结行为进行了研究,薄膜在1300℃等温烧结后实现完全致密化。通过薄膜制备过程中制浆与成膜两个步骤的有机结合,探讨一条制备高性能GDC电解质薄膜的新途径。Gadolinia doped ceria（GDC） nano-powder was synthesized through a homogeneous precipitation process,using hexamethylenetetramine as the precipitator.XRD revealed that the as-synthesized powder already had a cubic fluorite structure of ceria,and BET revealed that the GDC powder had a surface area of 68.3m^2/g and an average grain size of about 12 nanometers.Sintering behaviors of the GDC powder were studied via non-isothermal experiments.It demonstrated that the powder exhibited high sintering activity,where GDC green films prepared via dip coating using the slurry directly formed by the homogeneous precipitation process can be sintered to nearly full density at 1300℃,as revealed by the Field Emission SEM investigations.The thickness of the sintered GDC film after one coating-sintering cycle was 3μm and it can be controlled through adjusting the GDC concentration in the slurry and repeating the coating-sintering cycle.

关 键 词：GDC 浸渍-提拉法 薄膜 场发射扫描电镜 

分 类 号：TQ133.3[化学工程—无机化工]