An in situXAS investigation of the kinetics of the ammonolysis of Ga2O3 and the oxidation of GaN
Literature Information
J. Brendt, D. Samuelis, T. E. Weirich, M. Martin
The ammonolysis of β-Ga2O3 to α-GaN and the oxidation of α-GaN to β-Ga2O3 have been studied by means of in situX-ray absorption spectroscopy (XAS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). In situ X-ray absorption measurements on polycrystalline powder particles on the gallium K-edge during both reactions give detailed information about the reaction kinetics. We were able to extract this kinetics by fitting linear combinations of β-Ga2O3 and α-GaN spectra only. The kinetics of the ammonolysis can be described well by an extended Johnson–Mehl–Avrami–Kolmogorow model, while the oxidation kinetics can be modelled by a shrinking core model. Investigations by means of TEM and SEM support the assumptions in both models. Our experimental results and the models are discussed in terms of the reaction energetics and the reaction mechanisms.
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