Materials with potential for high temperature inorganic pigment applications (e.g.
ceramics) have been synthesised using solid state methods and characterised using
powder X-ray and neutron diffraction, magic angle spinning NMR, Mossbauer
spectroscopy, UVNis spectroscopy and colour measurement techniques.
A number of compounds containing tin (H) and niobium (V) have been
modified and doped with various constituents to tailor and widen the colour properties
of the bright yellow parent phases. The dark yellow (L*(91.28), a*(13.74), b*(54.76)
tin niobium oxide pyrochlores have been re-characterised using neutron diffraction
techniques. These materials exhibit both cation and anion disorder caused by a
stereoactive lone pair on the tin (H) metal centres. Solid state NMR and Mossbauer
studies have shown the presence of tin (IV) on a symmetric site within the primary
phase of the pure oxide pyrochlore and methods have been investigated to minimise the
tin (H) disproportion method from where the tin (IV) is derived....
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.