Characterization of nanometric multidoped ceria powders

▶ Since the data on the difference in properties between powders in nanomteric range are generally very limited, ceria solid solutions with up to six dopants were prepared and characterized in detail. It turned out that lattice strain was surprisingly higher in coarser powder. On the other hand the results show how the loose nanometric powders with different particle sizes build agglomerate including the pores within. Finer powder forms micropores, while coarser one forms mesopores. Unexpectedly, finer powder flows, which is from technological point of view very important for practical purposes. Powder flow was performed by applying internal comparative method. The same weights of powders were poured into the funnel and the time in which the powder run out of the funnel was measured for each powder. ▶ Since the question of powders history does not have an answer even not to-day, the differences found so far in the literature are usually connected to the particle dimension as measurable parameter. According to the given explanations in our study, we assumed that the different chemical methods and associated thermal effects of MGNP method, opposite to the SPRT-room synthesis, are responsible for differences in the powder properties.