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J. Korean Ceram. Soc. > Volume 40(8); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(8): 720.
doi: https://doi.org/10.4191/kcers.2003.40.8.720
Preparation of Aluminum Nitride Powders and Whiskers Using Aluminum(III) Salts as a Precursor
Woo-Sik Jung, Seen-Ae Chae1
School of Chemical Engineering and Technology, College of Engineering, Yeunngnam University
1Korea Basic Science Institute Daegu Branch
Aluminum nitride (AlN) powders were synthesized by using a mixture of an aluminum nitrate or sulfate salt and carbon (mole ratio of $Al^{3+}$ to carbon=L : 30). The AlN was obtained by calcining the mixture under a flow of nitrogen in the temperature range 1100-1$600^{circ}C$ and then burning out the residual carbon. The process of conversion of the salt to AlN was monitored by XRD and $^{27}$ Al magic-angle spinning (MAS) NMR spectroscopy. The salt decomposed to ${gamma}$-alumina and then converted to AlN without phase transition from ${gamma}$-to-$alpha$-alumina. $^{27}$ Al MAS NMR spectroscopy shows that the formation of AlN commenced at 110$0^{circ}C$. AlN powders obtained from the sulfate salt were superior to those from the nitrate salt in terms of homogeneity and crystallinity. A very small amount of AlN whiskers was obtained by calcining a mixture of an aluminum sulfate salt and carbon at 115$0^{circ}C$ for 40 h, and the growth of the whiskers is well explained by the particle-to-particle self-assembly mechanism.
Key words: Aluminum nitride, Aluminum(III) salts, Whisker, Growth mechanism, $^{27}$ Al MAS NMR
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