Influence of Preparation Temperature on Performance of Ce_(1-x)Pr_xO_2 Ultrafine Powder Prepared by a Microemulsion Process

摘要

A W/O microemulsion system composed of OP-emolsifier / water / cyclohexane / 1-Pentanol was adopted to prepare ultrafine Ce_(1-x)Pr_xO_2 powder via the reaction between the precipitants of cerium and praseodymium salt solved in the nano reactors. The influence of the annealing conditions on the preparation of Ce_(1-x)Pr_xO_2 powder was investigated. It was shown that, with the increase of calcination temperature from 400℃ to 800℃, the average crystallite size of the particles increases from 9.5 nm to 25.8 nm. FE-SEM images showed that shape of the particles is layered and sheet-like.