Abstract
A comparative structural and spectroscopic study, combined with reactivity tests in (inverse) water–gas shift and methanol steam reforming reaction, has been performed on various Ga2O3 polymorphs with special focus on δ-Ga2O3 and ε-Ga2O3 with the aim of highlighting the eventual intrinsic physico-chemical properties of the latter two. Using this comparative approach, the question whether δ-Ga2O3 in fact is a nanocrystalline modification of ε-Ga2O3, a mixture of ε-Ga2O3 and β-Ga2O3, or a single polymorphic form could be answered: especially Raman spectroscopy measurements, alongside reactivity tests, indicate that δ-Ga2O3 exhibits lots of properties of ε-Ga2O3. In fact, particularly in Raman measurements it appears as a mixture of ε-Ga2O3 and β-Ga2O3.
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Acknowledgments
The work was performed within the platform “Material- and Nanoscience” at the University of Innsbruck. Financial support of the SFB project F45, funded by the Austrian Science Fund, is greatly acknowledged. We thank R. Tessadri for assistance with the EDXRFA measurements.
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Penner, S., Zhuo, C., Thalinger, R. et al. Physico-chemical properties of unusual Ga2O3 polymorphs. Monatsh Chem 147, 289–300 (2016). https://doi.org/10.1007/s00706-015-1628-z
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DOI: https://doi.org/10.1007/s00706-015-1628-z