Growth of magnesium aluminate nanocrystallites

Nanocrystalline magnesium aluminate was synthesized with the coprecipitation method. Its growing behaviors as a function of temperature were studied with synchrotron X-ray diffraction (XRD) and Raman spectroscopy. It is found that the particle growth was greatly inhibited at temperatures below 1000...

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Published in:CrystEngComm 2014-01, Vol.16 (8), p.1579-1583
Main Authors: Tan, Dayong, Zhou, Wei, Ouyang, Wenzhu, Mi, Zhongying, Kong, Lingping, Xiao, Wansheng, Zhu, Kai, Chen, Bin
Format: Article
Language:English
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Summary:Nanocrystalline magnesium aluminate was synthesized with the coprecipitation method. Its growing behaviors as a function of temperature were studied with synchrotron X-ray diffraction (XRD) and Raman spectroscopy. It is found that the particle growth was greatly inhibited at temperatures below 1000 °C due to the hydroxide precursor reactants. Above 1000 °C, magnesium aluminate nanoparticles start to grow fast. After two hours annealing at 1200 °C, the grain size changes by multiple folds, suggesting that oriented attachment may occur. Above 1200 °C, the grain size changes in various directions are much smaller than the average grain size, indicating the oriented attachment mechanisms become inactive in the growth of MgAl 2 O 4 nanoparticles with sizes larger than 42 nm. The growth of MgAl 2 O 4 in calcinations reveals that besides diffusion, oriented attachment is another possible growth path for nanoparticles.
ISSN:1466-8033
1466-8033
DOI:10.1039/c3ce41718b