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A study of Fe3+ ions in NH4Al(SO4)2 12H20; using electron paramagnetic resonance and the Mössbauer effect

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dc.contributor.author Trotter, Kevin
dc.date.accessioned 2011-03-10T22:53:23Z
dc.date.accessioned 2022-10-25T04:37:30Z
dc.date.available 2011-03-10T22:53:23Z
dc.date.available 2022-10-25T04:37:30Z
dc.date.copyright 1968
dc.date.issued 1968
dc.identifier.uri https://ir.wgtn.ac.nz/handle/123456789/23178
dc.description.abstract Electron Paramagnetic Resonance (EPR) of Fe(H2O)6 3+ in a single crystal of ammonium aluminium alum, 1 Fe to 400 Al, is partially interpreted by the spin Hamiltonian - This assumes that the crystalline field is an admixture of cubic and trigonal components. It was found that the crystalline axes are trigonal (111) and the best fit values of the parameters are, g = 1.978 ± 0.007, D = ±270 gauss, a = ±4, F = ±14g. A broad resonance at g = 2 is interpreted as an exchange narrowed absorption of ferric ions at an imperfection. Both EPR and the Mossbauer effect indicate a slightly distorted ion, for which the quadrupole splitting, ∆EQ = 0.03 mm/sec. The ion is trivalent as its isomer shift is between 0.4 to 0.5 mm/sec relative to metallic iron. A possible explanation of the broad Mossbauer resonance at zero magnetic field is that the electron spins are ordered within the crystal and there are two types of sites. One of these is the trivalent ion position of alum and the other is a range of environments, consequent of some crystal imperfection. en_NZ
dc.format pdf en_NZ
dc.language en_NZ
dc.language.iso en_NZ
dc.publisher Te Herenga Waka—Victoria University of Wellington en_NZ
dc.title A study of Fe3+ ions in NH4Al(SO4)2 12H20; using electron paramagnetic resonance and the Mössbauer effect en_NZ
dc.type Text en_NZ
vuwschema.type.vuw Awarded Research Masters Thesis en_NZ
thesis.degree.discipline Chemistry en_NZ
thesis.degree.grantor Te Herenga Waka—Victoria University of Wellington en_NZ
thesis.degree.level Masters en_NZ


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