La_(1.9)Sr_(0.1)Ni_(0.9)Cu_(0.1)O_(4+δ)混合导体的合成与导电性能研究  

Synthesis and electrical properties of La_(1.9)Sr_(0.1)Ni_(0.9)Cu_(0.1)O_(4+δ) mixed conductor

作　　者：黄端平[1] 徐庆[1] 张枫 陈文[1] 刘韩星[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《功能材料》2008年第3期398-402,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50572079);国家教育部新世纪优秀人才支技术计划资助项目(NECT-04-0724)

摘　　要：采用氨基多羧酸配合物法合成La1.9Sr0．1Ni0.9Cu0．1O4＋δ超细粉料，对合成产物的结构和性能进行了表征。研究结果表明，配合物前驱体经900℃保温2h热处理即形成单一的K2NiF4结构，合成粉料的颗粒细小、均匀（约100nm）。X射线衍射Rietveld分析结果显示，La1．9Sr0．1Ni0．9Cu0．1O4＋δ为正交结构（空间群为Fmmm）。与La1．9Sr0．1NiO4＋δ相比，La1．9Sr0．1Ni0．9Cu0．1O4＋δ表现出较好的烧结性能。与La2Ni0．9Cu0．1O4＋δ相比，如La1.9Sr0．1Ni0.9Cu0．1O4＋δ具有较高的总电导率。在1400℃烧结的La1．9Sr0．1Ni0．9Cu0．1O4＋δ的相对密度达到95．3％，在600～800℃的测试温度范围内陶瓷样品的总电导率为78～99S／cm，在800℃的测试温度下陶瓷样品的氧离子电导率为2．0×10^-2S／cm。La1. 9Sr0. 1Ni0. 9Cu0.1O4＋δ powder was synthesized by a polyarninocarboxylate complex method, and the structure and properties of synthesized powder and resulting ceramic were characterized. The results indicate that homogeneous and fine powder （about 100nm） with a pure K2NiF4 phase can be produced by calcining the complex precursor at 900℃ for 2h in air. The rietveld refinement using X-ray diffraction data reveals that La1. 9Sr0. 1Ni0. 9Cu0.1O4＋δ composition has an orthorhombic structure with Frnmm space group. La1. 9Sr0. 1Ni0. 9Cu0.1O4＋δ exhibits an improved sintering property compared with La1. 9Sr0. 1Ni0. 9Cu0.1O4＋δ and an increased electrical conductivity compared with La2Ni0.9Cu0.1O4＋δ.La1. 9Sr0. 1Ni0. 9Cu0.1O4＋δ ceramic sintered at 1400℃ offers a relative density of 95.3%,attaining electrical conductivities of 78-99S/cm at 600-800℃ together with an oxygen ionic conductivity of 2.0×10^-2S/cm at 800℃.

关 键 词：La1.9Sr0.1Ni0.9Cu0.1O4+δ 混合导体 氨基多羧酸配合物法 电导率 

分 类 号：TQ174[化学工程—陶瓷工业]