A range of inorganic materials, with structures based on transition metal centred polyhedra linked through simple or polyatomic anions, has been synthesised and fully characterised. These materials were prepared using a variety of synthetic methods, including the direct high temperature, solid state reactions, and hydrothermal techniques in fluoride rich media. The materials produced were structurally characterised by powder (PXD) and single crystal (SXD) X-ray diffraction techniques with further analysis via infrared and UV/visible/near-infrared spectroscopies, thermogravimetric analysis and scanning electron microscopy. Copper (II) phosphates and related materials have potential applications derived from their near-infrared (NIR) radiation absorbing properties. A range of complex copper phosphate phases in the Cu-P-O or A-Cu-P-O systems, where A is a Group 1 or 2 element, has been synthesised and characterised. The intensity and positions of absorptions in the NIR region found for these materials and derived from d-d transitions on copper, are dependent upon the copper ion coordination geometry and the ligand field produced by the surrounding anions. K2CuP2O7 and the phases A3Cu3(PO4)3 (A = Sr, Ca) were all found to absorb strongly in the NIR region. The NIR absorbance spectrum could be modified further by introducing fluoride into the Cu(II) ligand environment and Cu2PO4F was shown to have a very strong, broad NIR absorption spectrum.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:629666 |
| Date | January 2014 |
| Creators | Wang, Qianlong |
| Publisher | University of Bath |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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