Multinuclear MAS NMR investigation of sol-gel and ball-milled nanocrystalline Ga2O3

O'Dell, Luke A. and Savin, Shelly L. P. and Chadwick, Alan V. and Smith, Mark E. (2007) Multinuclear MAS NMR investigation of sol-gel and ball-milled nanocrystalline Ga2O3. Applied Magnetic Resonance, 32 (4). pp. 527-546. ISSN 0937-9347. (Access to this publication is restricted)

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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: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Alan Chadwick
Date Deposited: 04 Jul 2008 13:55
Last Modified: 14 May 2014 11:05
Resource URI: http://kar.kent.ac.uk/id/eprint/8535 (The current URI for this page, for reference purposes)
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