On the ammonolysis of Ga sub(2)O sub(3): An XRD, neutron diffraction and XAS investigation of the oxygen-rich part of the system Ga sub(2)O sub(3)-GaN

We investigated the ammonolysis of beta -Ga sub(2)O sub(3) 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...

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Bibliographic Details
Published in:Journal of solid state chemistry 2010-03, Vol.183 (3), p.532-541
Main Authors: Roehrens, D, Brendt, J, Samuelis, D, Martin, M
Format: Article
Language:English
Subjects:
Ammonolysis
Diffraction
Gallium nitrides
Monitoring
Neutron diffraction
Oxynitrides
Solubility
X-rays
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Summary:We investigated the ammonolysis of beta -Ga sub(2)O sub(3) 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 beta -Ga sub(2)O sub(3) related oxynitride phase was found, and the nitrogen solubility in beta -Ga sub(2)O sub(3) 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 beta -Ga sub(2)O sub(3) 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. AB:
ISSN:0022-4596
DOI:10.1016/j.jssc.2009.12.024