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Multinuclear MAS NMR Investigation of Sol-Gel and Ball-Milled Nanocrystalline Ga2O3

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Abstract.

71Ga magic-angle spinning (MAS) nuclear magnetic resonance (NMR) has been used to characterize the structural evolution of nanocrystalline Ga2O3 samples prepared by sol-gel and ball-milling techniques. 29Si and 27Al MAS NMR have also been used to characterize silica and alumina Zener pinning phases. 71Ga NMR parameters are reported for the α- and β-Ga2O3 phases, and more tentatively for the δ-Ga2O3 phase. By simulating the octahedrally coordinated gallium NMR line of β-Ga2O3 using Gaussian distributions in χQ, the extent of disorder in the Ga2O3 crystallites has been quantified. The ball-milled samples contain much more inherent disorder than the sol-gel samples in the nano-phase, which was observed from simulations of the 71Ga MAS NMR spectra. The silica pinning phase produced highly crystalline and densely aggregated nanocrystalline Ga2O3, as well as the smallest nanocrystal sizes.

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Authors and Affiliations

  1. Department of Physics, University of Warwick, Coventry, United Kingdom

    L. A. O'Dell & M. E. Smith

  2. School of Physical Sciences, University of Kent, Canterbury, United Kingdom

    S. L. P. Savin & A. V. Chadwick

Authors
  1. L. A. O'Dell
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  2. S. L. P. Savin
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  3. A. V. Chadwick
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  4. M. E. Smith
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Authors' address: Mark E. Smith, Department of Physics, University of Warwick, Coventry CV4 7AL, UK

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O'Dell, L., Savin, S., Chadwick, A. et al. Multinuclear MAS NMR Investigation of Sol-Gel and Ball-Milled Nanocrystalline Ga2O3 . Appl Magn Reson 32, 527–546 (2007). https://doi.org/10.1007/s00723-007-0036-x

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  • DOI: https://doi.org/10.1007/s00723-007-0036-x

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