SPECTROSCOPIC STUDIES OF THE STRUCTURE OF TITANOPHOSPHATE AND CALCIUMTITANOPHOSPHATE GLASSES

The polyhedral arrangements in xTiO(2 .)(1-x)P2O5 (0.55 less than or e qual to x less than or equal to 0.70) and yTiO(2 .)(1-y)Ca(PO3)(2) gla sses have been characterised by Raman spectroscopy, electron spin reso nance (ESR) spectroscopy and solid state P-31 magic angle nuclear magn etic resonance (MAS NMR) spectroscopy In the binary titanophosphate gl asses, structures consist of distorted Ti octahedra linked to orthopho sphate units through Ti-O-P bonds. There is evidence for Ti-O-Ti linka ges in the Raman spectra from glasses with the highest TiO2 contents. When titania is added to calcium metaphosphate glass, phosphate chains are depolymerised by the incorporation of distorted Ti(5) and Ti(6) u nits through Ti-O-P bonds. Pyrophosphate units are present in glasses with the highest TiO2 contents.