Local site symmetry and electronic structure of trialuminide and related intermetallic alloys probed by solid-state NMR

Bastow, Timothy J. and Forwood, C.T. and Gibson, M.A. and Smith, Mark E. (1998) Local site symmetry and electronic structure of trialuminide and related intermetallic alloys probed by solid-state NMR. Physical Review B: Condensed Matter and Materials Physics, 58 (6). pp. 2988-97. ISSN 0163-1829. (The full text of this publication is not available from this repository)

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Abstract

Intermetallic aluminide alloys with the L1(2), DO22, DO23, and Al2Ti crystal structures have been examined by NMR using the Al-27 resonance to investigate how changes in crystal structure affect the local environment as indicated by hyperfine interactions at the atomic nucleus. All nonequivalent Al sites have been clearly resolved. Further, the environment of the transition metal component in each intermetallic crystal structure has been investigated using the Sc-45 resonance in the L1(2) structure of Al3Sc, the Ti-49 resonance in the DO22 structure of Al3Ti, and in Al2Ti, the V-51 resonance in the DO22 structure of Al3V and the Zr-91 resonance in the DO23 structure of Al3Zr. Using a combination of static and magic-angle spinning Fourier transform NMR, and static field sweep spectroscopy, the isotropic Knight shifts (K-iso) and the nuclear quadrupole coupling constants (C-q) have been determined for all nuclei and all sites. In some cases the Al-27 axial Knight shift (K-ax) has been obtained. In the trialuminides each Al site located by NMR has been identified with the corresponding site in the unit cell of the crystal structure.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: I. Ghose
Date Deposited: 04 Apr 2009 21:13
Last Modified: 17 Jun 2014 10:40
Resource URI: http://kar.kent.ac.uk/id/eprint/17574 (The current URI for this page, for reference purposes)
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