Influence of pH on Morphology and Formation Mechanism of CeO2 Nanocrystalline
来源期刊：JOURNAL OF RARE EARTHS2007年第1期
论文作者：Nie Zuoren Mei Yan Wang Wei
Key words：pH value; cerium oxide crystal; morphology; mechanism; rare earths;
Abstract: Nanoparticles of cerium oxide were prepared by common precipitation method using cerium nitrate solution and ammonia reagent. Cerium oxide particles with different morphologies were synthesized through adjusting pH values of the solution. TEM and BET results showed that spherical crystal was gained in acid solution, with the specific surface of 148.1944 m2·g-1. The cerium oxide appeared in the form of spherical and rod-like grains under neutral condition, and the specific surface changed to 114.7975 m2·g-1. Moreover, in alkaline solution, cerium oxide powders were exhibited in rod-like form with the specific surface of 106.2465 m2·g-1. Precipitation formation mechanism of different morphologies was also discussed, which followed decomposition precipitation mechanism and topology reaction mechanism in acid and alkaline solution, respectively.
Nie Zuoren1，Mei Yan1，Wang Wei1
(1.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China)
Abstract:Nanoparticles of cerium oxide were prepared by common precipitation method using cerium nitrate solution and ammonia reagent. Cerium oxide particles with different morphologies were synthesized through adjusting pH values of the solution. TEM and BET results showed that spherical crystal was gained in acid solution, with the specific surface of 148.1944 m2·g-1. The cerium oxide appeared in the form of spherical and rod-like grains under neutral condition, and the specific surface changed to 114.7975 m2·g-1. Moreover, in alkaline solution, cerium oxide powders were exhibited in rod-like form with the specific surface of 106.2465 m2·g-1. Precipitation formation mechanism of different morphologies was also discussed, which followed decomposition precipitation mechanism and topology reaction mechanism in acid and alkaline solution, respectively.
Key words:pH value; cerium oxide crystal; morphology; mechanism; rare earths;
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