【摘要】 采用低温燃烧合成法,在柠檬酸-硝酸盐体系中合成了Ce1-xNdxO2-x／2(0≤x≤0．6)固溶体纳米粉体．X射线衍射(XRD)结果表明,Nd3+取代Ce4+形成具有单相立方萤石结构的固溶体,其晶格常数随Nd3+掺杂浓度的增大而线性增加,晶粒尺寸在15-24 nm之间．透射电镜(TEM)结果表明,粉体颗粒尺寸在20-40 nm之间,分散性较好,具有较高的烧结活性．Raman光谱结果表明,F2g宽化峰的出现与掺杂后固溶体中产生的氧空位有关,并且随着掺杂浓度的增加,氧空位数量也随之增加．X射线荧光光谱(XRF)的分析表明,实际掺杂浓度非常接近原始化学计量比．更多还原

【Abstract】 Nano-crystalline Ce1-xNdxO2-x/2 (0≤x≤0.6) powders were prepared by lowtemperature combustion process with citrate acid-nitrate system. The influences of the amount of doping Nd3+ substituted for Ce4+ on the phase structure, morphology and particle size of the powers were studied. XRD indicated that the as-prepared powders are single fluorite structure with crystalline size ranging from 15 to 24 nm, and the lattice constant increases with the increase of the doping amount x. TEM showed that the particles size ranges from 30 to 40 nm. The broader Raman band at 580 cm-1 is attributed to the presence of oxygen vacancies, which increase with increasing the doping amount. The XRF showed that the actual doping concentration is close to the original chemical composition.更多还原