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Hyperfine Interactions in the Solid State and their Role in Materials Analysis

Dr Tim Bastow

Materials and Infrastructure Technology, CSIRO

3.30pm, Friday 28 May 2004, AR103 Seminar Room, Graduate Research Centre

A brief introduction will be given on the use of NMR in materials analysis and illustrated by recent work on Zn halides [1], Ni-based intermetallics [2] and dilute Al alloys (Al-Cu-Mg) [3]. The work uses various high-spin (I=3/2) nuclear probes, 7Li, 25Mg, 27Al, 47,49Ti, 61Ni, 63Cu, 67Zn, 69Ga and 115In, mostly positioned at sites of non-cubic symmetry, so that strong nuclear quadrupole interactions are encountered. The analysis of these interactions to give the components of the electric field gradient tensor (Vzz, h) will be given and a comparison made with the values of (Vzz, h) derived from density functional-based ab initio methods [4]. The metallurgical significance of the detection and quantification of equilibrium and non-equilibrium precipitates in dilute Al alloys will be briefly discussed.

[1] T.J. Bastow, Chem. Phys. Lett, 380, 516 (2003)
[2] T.J. Bastow and G.W. West, J. Phys:Condens. Matter, 15, 8389 (2003)
[3] T.J. Bastow and S. Celotto, Acta Materialia, 51, 4621 (2003)
[4] T.J. Bastow, M.I. Burgar, C. Maunders, Solid State Communs, 122, 629 (2002)

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