Bulk Al_xGa_1-xN and GaN single crystals have been grown, using (Ga,Al) alloys and pure Ga under high nitrogen pressure. Gas (up to 15 kbar) and solid pressure medium setups (up to 35 kbar) are used to provide the pressure required for phase stabilization. The solubility of Al was studied by growing crystals at various temperatures (1400 - 1750C). Mass spectrometric analysis reveals a rapidly increasing Al solubility at higher temperature. Thus, the growth temperature, together with the composition of the starting materials, serves as a parameter to control the Al content. For the maximum temperature of the gas autoclave (T=1600C) an upper limit of ~2% Al is determined. Using the solid pressure medium setup (T_max=1750C) Al_xGa_1-xN crystals with x=0.3 and a size of up to 0.6 x 0.4 x 0.2 mm³ are synthesized. X-ray diffraction investigations confirm the growth of the single crystalline Al_xGa_1-xN phase. Room temperature photoluminescence spectroscopy shows a blue-shift by up to ~0.4 eV of the band gap related peak, further confirming significant Al substitution.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/2393 must be provided.

1. LnFeAsO single crystals grown at high pressure: influence of doping and substitutions on superconducting properties and structure
2. Effect of Li-C and Li-Al codoping in MgB₂ single crystals
3. Single crystals of MgB₂: synthesis, substitutions and properties
4. MgB₂ single crystals, influence of magnetic and non-magnetic ions substitution on superconducting properties and structure
5. Single crystals of pure and substituted MgB₂: crystal growth and physical properties
6. The superconducting gaps of C-substituted and Al-substituted MgB2 single crystals by point-contact spectroscopy