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Multinuclear MAS NMR investigation of sol-gel and ball-milled nanocrystalline Ga2O3
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O'Dell, L. A., Savin, S. L. P., Chadwick, A. V. and Smith, Mark E. (2007) Multinuclear MAS NMR investigation of sol-gel and ball-milled nanocrystalline Ga2O3. Applied Magnetic Resonance, Vol.32 (No.4). pp. 527-546. doi:10.1007/s00723-007-0036-x ISSN 0937-9347.
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Official URL: http://dx.doi.org/10.1007/s00723-007-0036-x
Abstract
Ga-71 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. Si-29 and Al-27 MAS NMR have also been used to characterize silica and alumina Zener pinning phases. Ga-71 NMR parameters are reported for the alpha- and beta-Ga2O3 phases, and more tentatively for the delta-Ga2O3 phase. By simulating the octahedrally coordinated gallium NMR line of beta-Ga2O3 using Gaussian distributions in chi(Q), 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 Ga-71 MAS NMR spectra. The silica pinning phase produced highly crystalline and densely aggregated nanocrystalline Ga2O3, as well as the smallest nanocrystal sizes.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Administration > University Executive Office Faculty of Science, Engineering and Medicine > Science > Physics |
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Journal or Publication Title: | Applied Magnetic Resonance | ||||
Publisher: | Springer | ||||
ISSN: | 0937-9347 | ||||
Official Date: | December 2007 | ||||
Dates: |
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Volume: | Vol.32 | ||||
Number: | No.4 | ||||
Number of Pages: | 20 | ||||
Page Range: | pp. 527-546 | ||||
DOI: | 10.1007/s00723-007-0036-x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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