Nitridation of δ-alumina to aluminum nitride under a flow of ammonia and its mechanism

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  • KIM Jun-Kwang
    School of Chemical Engineering, College of Engineering, Yeungnam University
  • JUNG Woo-Sik
    School of Chemical Engineering, College of Engineering, Yeungnam University

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  • Nitridation of δ-alumina to aluminum nitride under a flow of ammonia and its mechanism
  • Nitridation of d alumina to aluminum nitride under a flow of ammonia and its mechanism

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Nanosized δ-alumina (δ-Al2O3) powders were calcined at various temperatures under a flow of ammonia (NH3) passing over a carbon black-containing crucible. The nitridation process of δ-Al2O3 to aluminum nitride (AlN) was monitored by powder X-ray diffraction, infrared (IR) spectroscopy, and 27Al magic-angle spinning nuclear magnetic resonance spectroscopy. δ-Al2O3 began to be converted to AlN at 1150°C without δ-α alumina transformation and the conversion was completed at 1300°C for 5 h. The IR spectra of the gases evolved during the nitridation revealed the inclusion of NH3, CH4, HCN, and CO gases. Results on the calcination of δ-Al2O3 under a flow of acetonitrile diluted in argon indicated that HCN is involved in the nitridation reaction of δ-Al2O3.

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