A simple sol–gel technique for preparing lanthanum oxide nanopowders

Nanosized lanthanum oxide powders have been prepared by a simple sol–gel technique using commercial lanthanum oxide, nitrate acid and polyethylene glycol (PEG) as the starting materials. The decomposition process of dried gel powders were investigated by differential thermal and thermogravimetric an...

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Bibliographic Details
Published in:Materials letters 2006-08, Vol.60 (17), p.2261-2265
Main Authors: Wang, Xingang, Wang, Maolin, Song, Hua, Ding, Bingjun
Format: Article
Language:English
Subjects:
Calcination
Concentration
Lanthanum oxide
Nanopowder
Sol–gel process
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Summary:Nanosized lanthanum oxide powders have been prepared by a simple sol–gel technique using commercial lanthanum oxide, nitrate acid and polyethylene glycol (PEG) as the starting materials. The decomposition process of dried gel powders were investigated by differential thermal and thermogravimetric analysis(TG-DSC). The crystalline structures and morphologies of the powders were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The effects of calcination temperature, calcination time, stirring and the concentration of PEG on the particle size were studied. The results show that the calcination temperature and concentration of PEG have obvious influence on the La 2O 3 particle size and agglomeration tendency. At lower calcination temperature the prolongation of calcination time has slight influence on the particle size. Stirring will promote the growth of particles. The weak-agglomerated nanosized powders with the mean particle size less than 40 nm could be obtained by controlling the process condition.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2005.12.142