| 질소 분위기에서 (NH4)[Al(edta)]·2H2O 착물으로부터 질화알루미늄 분말 및 휘스커의 합성 |
| 정우식 |
| 영남대학교 응용화학공학부 |
| Synthesis of Aluminum Nitride Powers and Whiskers from a (NH4)[Al(edta)]·2H2O Complex under a Flow of Nitrogen |
| Woo-Sik Jung |
| School of Chemical Engineering and Technology, College of Engineering, Yeungnam University |
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| ABSTRACT |
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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. |
| Key words:
Aluminum nitride, Powers, Whiskers, Carbothermal reduction, Intermediates |
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