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Systematic XPS study of gallium-substituted boehmite

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Abstract

Ga-substituted boehmites were synthesized using a soft-chemistry route in the presence of poly(ethylene oxide) surfactant under hydrothermal conditions. The effect of Ga-substitution was studied by X-ray diffraction and X-ray photoelectron spectroscopy. Initial precipitates were amorphous (minor bayerite). After hydrothermal treatment, XRD showed broad reflections at low Ga-substation indicating low crystallinity and formation of pseudoboehmite. This was confirmed by high-resolution XPS of Al 2p, Ga 2p, and O 1s. The Al 2p binding energy of 74.03 eV was closer to boehmite than pseudoboehmite, probably caused by the Ga-substitution in the structure. The O 1s showed the presence of O, OH, and H2O. The ratio of (total O)/(Al + Ga) showed an excess of O as expected for pseudoboehmite. The ratio of (O + OH)/Al + Ga) was also slightly larger than the theoretical value of 2 for boehmite. High concentrations of added Ga (10, 20 %) resulted in amorphous material after hydrothermal treatment.

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Acknowledgements

The authors acknowledge the facilities, and the scientific and technical assistance, of the Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy and Microanalysis, The University of Queensland.

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Authors and Affiliations

  1. School of Earth Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia

    J. Theo Kloprogge

  2. Centre for Microscopy & Microanalysis, The University of Queensland, Brisbane, QLD, 4072, Australia

    Barry J. Wood

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  1. J. Theo Kloprogge
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Correspondence to J. Theo Kloprogge.

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Kloprogge, J.T., Wood, B.J. Systematic XPS study of gallium-substituted boehmite. J Mater Sci 51, 5436–5444 (2016). https://doi.org/10.1007/s10853-016-9847-1

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  • DOI: https://doi.org/10.1007/s10853-016-9847-1

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