【摘要】 以Ce（NO₃）₃·6H₂O、Pr₆O₁₁为原料,聚乙二醇为表面分散剂,采用共沉淀剂-水热法制备了Pr-CeO₂纳米粉体。采用X射线衍射仪、比色计、Raman光谱、透射电镜研究了不同pH值对粉体晶体结构、呈色性能和形貌的影响。结果表明:碱性水热环境下,Pr部分溶解于CeO₂晶格。易生成分散性较好的小晶粒。酸性水热环境下,晶粒的发育更完善,晶粒尺寸变大,Pr在CeO₂晶格中的溶解度增大,氧空穴浓度也增大。更多还原

【Abstract】 Pr-CeO₂ nano-powders were prepared by a co-precipitation-hydrothermal method,using Ce（NO₃）₃·6H₂O,Pr₆O₁₁as raw materials and polyethylene glycol（PEG）as additive.The influences of different pH value on the crystallite structure,coloring proper- ties,morphologies and the oxygen vacancies of powders were studied by using X-ray diffraction,colorimeter,laser Raman spectra and transmission electron microscopy.The results show that,in the alkaline hydrothermal medium,praseodymium dissolves partly into the crystal lattice of CeO₂,and small crystallites with good dispersion are easily formed.In the acidic hydrothermal medium,the powders show morphologies with improved crystallization,and the crystallite sizes become larger.The solubility of praseodymium into the crystal lattice of CeO₂ and the concentration of oxygen vacancies both increase.更多还原