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Title: Synthesis and characterisation of new framework materials
Author: Redrup, Kate Victoria
ISNI:       0000 0004 2672 8956
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 2009
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Inorganic framework materials, with structures based on arsenate and phosphate, AsO4 and PO4, tetrahedra and a variety of octahedral metal units, such as hafnium, niobium and iron, have been synthesised and fully characterised. These materials have been synthesised by solvothermal techniques and the principal analytical technique to characterise the resulting single crystals has been Single Crystal X-ray Diffraction. Supporting analysis was carried out, using techniques such as Powder and Neutron Diffraction, Thermogravimetric Analysis, Electron Dispersive Spectroscopy and Infrared Spectroscopy. Of the hafnium arsenates and phosphates that have been synthesised, several are fluorinated and one is templated, such as Hf2F2(H(PO4)2)(NH4)2 and [Hf2F8(AsO4)][DABCO-H2](NH4) respectively. Similar layered frameworks have also been characterised and reported for titanium, zirconium and niobium. These structures all offer ion exchange potential, due to their ammonium cations and/or water molecules. The hydrogen iron phosphates that are discussed include two novel frameworks and one material which offers an improved model for the mineral lipscombite, Fe1.34(PO4)OH0.96. One of the new frameworks presented, (NH4)3Fe3(HPO4)6, offers particularly interesting potential applications as a high capacity battery material via lithium exchange reactions. The hydrothermal synthesis of two novel hydrated sodium tungstate structures is also discussed. One of these materials was found to contain a very high H : Na ratio, resulting in strong hydrogen bonding and a densely packed framework, which may be of interest in the field of high density liquids.
Supervisor: Weller, Mark T. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QD Chemistry