Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.331096
Title: The structure and dynamics of compounds related to fast ionic conductors
Author: Fitch, A. N.
ISNI:       0000 0001 3467 7309
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 1982
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Abstract:
Powder neutron diffraction studies have been performed on the deuterated form of the proton conductor HU02AsO4.4H2O both above and below the transition at 301K to a poorly conducting antiferro-electric phase. The observed structures have been rationalised in terms of the presence of two types of water dimer, H4O2 and [H5O2], whose dynamic interchange above the transition, in a scheme of hydrogen disorder, provides a simple mechanism for the high hydrogen mobility. Further diffraction studies on cation substituted LiUOAsO4.4D2O show a change to a structure which is completely ordered with adjacent water squares linked together via tetrahedral co-ordination about the lithium ion. Comparison of this structure with that of some similar cation substituted compounds allows the proposal of a mechanism for sodium mobility in NaUO2PO4.3H2O. The series of compounds Li2UCl6, Na2UCl6 and K2UCl6 have been investigated at room temperature by powder neutron diffraction, with the aim of assessing the importance of the light cation in the structures of such compounds. The decrease in polarising power of the cation through the series leads to structures in which the [UCl6]2- octahedron exhibits progressively greater o molecular character as the charge transfer from chloride to uranium increases. Measurements of the proton NMR spin-lattice relaxation time T1 as a function of temperature have been performed on the ammonia intercalation compounds TiS2(NH3) for three different stoichiometries of TiS2, ranging from 0.1-2.0% excess titanium. There appears to be no influence of excess titanium on the mobility of the ammonia molecules in contrast to LiTiS2 and NaTiS2, where there is a very marked decrease with increasing titanium content.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.331096  DOI: Not available
Keywords: Solid-state physics
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