掺杂纳米CeO_2块材的热稳定性研究

Thermal Stability of Doped Nanocrystalline Ceria Bulk

采用水热法合成了多种掺杂CeO2纳米粉,并研究其烧结性能,发现不同类型的金属氧化物掺杂对CeO2纳米粉的烧结性能有不同的影响。CdO有助于CeO2的烧结生长,而Al2O3,ZrO2则阻碍CeO2的烧结生长:MgO,CaO,SrO,BaO在较低温度下阻碍CeO2的烧结生长,在较高温度下则反而有助于CeO2的烧结生长,同时结晶析出杂质相。

Pure and metal-oxide-doped nanocrystalline ceria has been prepared by the hydrothermal technique, and the samples annealed at different temperatures to study the interaction between dopants and the ceria. The results indicated that CdO enhanced the growth of ceria particles while Al2O3 and ZrO2 hindered it. MgO, CaO, SrO and BaO only hindered the ceria-particle growth at lower temperatures. At higher temperatures, as the impurity phases crystallized, they no longer hindered the growth of ceria particles.