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A29 NMR spin-lattice relaxation study of paramagnetics -doped orthosilictes

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Show simple item record Sliwinski, David R. en_US 2009-10-02T13:19:48Z 2009-10-02T13:19:48Z 1991-10-02T13:19:48Z
dc.description.abstract A ~si MAS NMR study of spin-lattice relaxation behaviour in paramagnetic-doped crystalline silicates was undertaken, using synthetic magnesium orthosilicate (forsterite) and synthetic zinc orthosilicate (willemite) doped with 0.1% to 20% of Co(II), Ni(II), or CU(II), as experimental systems. All of the samples studied exhibited a longitudinal magnetization return to the Boltzmann distribution of nuclear spin states which followed a stretched-exponential function of time: Y=exp [- (tjTn) n], O<n<l For the most reliable experimental data, there is a bias toward n=O.Sj the few genuine cases of deviation from 1/2power are for dopant concentrations equal to or exceeding 2.5 percent dopant. In some cases we find agreement with theory, and observe a direct proportionality between the spin-lattice relaxation time and paramagnetic dopant ion concentration, with Tni[M2+]i=Tnj[M2+]j for a given dopant and mineral. There are many cases where this correlation is not apparent, however, and this is attributed to the structural, phase, and ion distribution complexities inherent in many of these systems. en_US
dc.language.iso eng en_US
dc.publisher Brock University en_US
dc.subject Nuclear magnetic resonance. en_US
dc.subject Spin-lattice relaxation. en_US
dc.subject Paramagnetism. en_US
dc.subject Silicates. en_US
dc.title A29 NMR spin-lattice relaxation study of paramagnetics -doped orthosilictes en_US
dc.type Electronic Thesis or Dissertation en_US M.Sc. Chemistry en_US Masters en_US
dc.contributor.department Department of Chemistry en_US Faculty of Mathematics and Science en_US

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