Synthesis of Aluminium Nitride using Urea-Precursor

Kyota Uheda, Masayuki Takahashi, Hirotsugu Takizawa, Tadashi Endo, Masahiko Shimada

Research output: Contribution to journalArticlepeer-review


We newly synthesized AlN using urea and aluminium chloride as the starting materials. By directly introducing aluminium chloride into a melted urea at 135°C, urea-precursor was formed under a non-aqueous condition and then no γ-Al2O3 was 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 1 hour. In this process the urea-precursor decomposed above 350°C, and the formation of AlN skeleton with a layer structure occurred 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. In our report we also discuss the preparation and decomposition processes of urea-precursor for the synthesis of AlN.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number1
Publication statusPublished - 1998 Jan


  • AlN powder
  • AlN skeleton
  • Ultrafine particles
  • Urea-precursor
  • γ-AlO

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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