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http://dx.doi.org/10.4191/KCERS.2002.39.3.272

Synthesis of Aluminum Nitride Powers and Whiskers from a (NH4)[Al(edta)]·2H2O Complex under a Flow of Nitrogen  

Jung, Woo-Sik (School of Chemical Engineering and Technology, College of Engineering, Yeungnam University)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.3, 2002 , pp. 272-277 More about this Journal
Abstract
Aluminum nitride (AlN) powders and whiskers were synthesized by a modified carbothermal reduction and nitridation where a ($NH_4)[Al(ethylenediaminetetraacetate)]{\cdot}2H_2O$ complex is used as precursor. The AlN powders were obtained by calcining the complex without mixing any carbon source under a flow of nitrogen in the temperature range 1200∼1500$^{\circ}$C and then burning out the residual carbon. The nitridation process was investigated by $^{27}Al$ magic-angle spinning (MAS) unclear magnetic resonance, infrared spectroscopy and X-ray diffraction. The complex is pyrolyzed, converted to ${\rho}$- and ${\gamma}$- alumina and then nitridated to AlN without ${\gamma}-{\alpha}$ alumina transition. The morphology of ${\gamma}$-alumina, when it was converted to AlN, was retained, strongly indicating that ${\gamma}$-alumina is converted to AlN through solid-state $AlO_xN_y$, not through gaseous intermediates such as aluminum and aluminaum suboxides. AlN whiskers were obtained, when a (0001) sapphire was used as a catalyst.
Keywords
Aluminum nitride; Powers; Whiskers; Carbothermal reduction; Intermediates;
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Times Cited By KSCI : 2  (Citation Analysis)
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