Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1330767 | Journal of Solid State Chemistry | 2010 | 10 Pages |
We investigated the ammonolysis of β-Ga2O3 at elevated temperatures by means of ex situ X-ray diffraction, ex situ neutron diffraction and in situ X-ray absorption spectroscopy. Within the detection limits of these methods, we can rule out the existence of a crystalline or amorphous oxynitride phase that is not derived from wurtzite-type GaN. No evidence for a β-Ga2O3 related oxynitride phase was found, and the nitrogen solubility in β-Ga2O3 was found to be below the detection limit of about 2–3 at% in the anionic sublattice. These findings were obtained by monitoring the anionic occupancy factors and the lattice parameters of the β-Ga2O3 phase obtained from total diffraction pattern refinement with the Rietveld method and by linear combination fitting of the X-ray absorption spectra that were recorded during the ammonolysis.
Graphical abstractThe ammonolysis of β-Ga2O3 powders forming GaN at temperatures of 600–780 °C was monitored by means of XRD, neutron diffraction and X-ray absorption spectroscopy in order to identify the possible intermediates and the solubility limit of nitrogen in the oxide lattice.Figure optionsDownload full-size imageDownload as PowerPoint slide