【摘要】 采用共沉淀法制备了Ce_0.8Sm_0.15-xNd_xBi_0.05O_2-δ（x=0,0.05,0.10,0.15）系列电解质粉体。使用热分析仪、X射线衍射仪（XRD）、拉曼光谱仪、紫外-可见光光谱仪（UV-Vis）分别对前驱体的分解过程、粉体的结构、表面化学状态及禁带宽度进行表征;使用扫描电子显微镜（SEM）和电化学交流阻抗频谱（EIS）技术分别对试样的断面形貌及电性能进行了测试。由热重-差示扫描量热法（TG-DSC）分析可知,前驱体的热分解温度约为291.4℃,XRD结果表明共沉淀法制备的Ce_0.8Sm_0.15-xNd_xBi_0.05O_2-δ电解质粉体呈单一的立方萤石结构。由拉曼光谱分析可知,Ce_0.8Sm_0.1Nd_0.05Bi_0.05O_1.5的氧空位浓度最高。各试样的禁带宽度为1.86～2.59 eV。电解质经1 300℃烧结5h后,晶粒大小均匀、致密度良好。在500～700℃,电导率随测试温度的升高而增大。在700℃时,Ce_0.8Sm_0.1Nd_0.05Bi_0.05O_1.5的电导率最大,其值为2.84×10^-2 S/cm,而且随着Nd³⁺掺杂量的增加,不同组分电解质的电导率先升高后降低。更多还原

【Abstract】 A series of Ce_0.8Sm_0.15-xNd_xBi_0.05O_2-δ（x=0,0.05,0.10,0.15） electrolytes were prepared by coprecipitation.The decomposition course of the precursor,crystal phase structure,surface chemical state and band gap energy of all the calcined powers were investigated by using thermal analyzer,Xray diffraction（XRD）,Raman spectrometer and UV-visible（UV-Vis）,respectively.The cross section images and electrical properties were investigated by scanning electron microscopy（SEM） and electrochemical AC impedance spectroscopy.The TG-DSC analysis indicates that the thermal decomposition temperature of the precursor is about 291.4℃.The XRD results show that the synthesized samples are cubic fluorite structure of single phase CeO₂.According to the results of the Raman spectra analysis,the Ce_0.8Sm_0.1Nd_0.05Bi_0.05O_1.5 has the highest oxygen vacancy concentration.The band gap energy value of all the samples is in the range of 1.86-2.59 eV.All the samples sintered at 1 300℃ for5 h have uniform grain size and good densification.In the temperature range of 500-700℃,the conductivity increases with the increase of the test temperature.The Ce_0.8Sm_0.1Nd_0.05Bi_0.05O_1.5 shows the highest conductivity with a value of 2.84×10^-2 S/cm at 700℃.The conductivity of different component electrolyte powders increases first and then decreases with the increase of Nd³⁺ doping amount.更多还原