GaN Synthesis by Ammonothermal Method |
| R. Dwiliński, A. Wysmołek, J. Baranowski, M. Kamińska Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warszawa, Poland R. Doradziński Institute of Theoretical Physics, Warsaw University, Hoża 69, 00-681 Warszawa, Poland J. Garczyński, L. Sierzputowski Dept. of Chemistry, Warsaw Univ. of Technology, Pl. Politechniki 1, 00-661 Warszawa, Poland and H. Jacobs Inorganic Chemistry Dept., Dortmund University, 44221 Dortmund, Germany |
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| It is shown that ammonothermal method can be successfully used to synthesize GaN powder of good crystallographic quality from ammonia solution at high pressure and a moderate temperature. The size of obtained GaN powder grains was of a few micrometers. The improvement of the powder crystalline quality (examined by X-ray rocking curve, scanning electron microscopy and luminescence measurements) with increasing molar proportion of mineralizer was observed. It was therefore possible to conclude that high molar proportion of mineralizer in ammonia solution plays a crucial role in the polycrystal growth process. Visible luminescence of high efficiency from the GaN powder was found. |
| DOI: 10.12693/APhysPolA.88.833 PACS numbers: 81.10.Dn |