Synthesis of aluminium nitride using urea-precursors

K. Uheda, M. Takahashi, H. Takizawa, T. Endo, M. Shimada

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We synthesized AlN using aluminium chloride hexahydrate and urea as the starting materials. By directly introducing aluminium chloride into melted urea at 135°C, a urea-precursor was formed under non-aqueous conditions with no γ-Al2O3 observed in any calcination steps. As a result, well-crystalline AlN powder was obtained by the pyrolysis of urea-precursor above 900°C under a stream of N2 gas for 1hour. In this process the urea-precursor decomposed below 400°C, and an AlN skeleton with a layer structure formed above 800°C. The total yield of AlN powder based on the Al atom was only 80% due to production of volatile Al(NH3)6AlH4Cl2 as a by-product. The AlN powder was characterized by X-ray diffraction, infrared spectroscopy and scanning electron microscopy (SEM). Morphological observation of the AlN powder by mean of SEM revealed large particles of about 30-μm diameter, which consisted of ultrafine particles of less than 1-μm diameter.

Original languageEnglish
Pages (from-to)53-58
Number of pages6
JournalKey Engineering Materials
Publication statusPublished - 1999 Jan 1


  • AlN Powder
  • AlN Skeleton
  • Ultrafine Particles
  • Urea-Precursor

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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