Study on the effect of vanadium oxide in calcium phosphate glasses by Raman, IR and UV–vis spectroscopy

• New calcium phosphate glass materials with progressive V2O5 content are proposed.
• IR and Raman spectra revealed the phosphate network depolymerisation by adding V2O5.
• The process produces non-bridging oxygen atoms involved in new V–O–V linkages.
• Vanadium oxide in high content acts as a network former.

Vanadium doped calcium phosphate glass materials with progressive V2O5 content were prepared and analyzed by Raman, IR and UV–vis spectroscopy. The changes induced by the presence of different amounts of vanadium ions and observed in the spectra were discussed in connection with the structural modifications of the glass network. Special attention was given to the dual role exerted by the vanadium ions, that of strong modifier agent for low vanadium content (less than 10 mol%) and that of glass network former for high vanadium content (higher than 20 mol%). The preparation and the characterization of the materials using non-conventional former oxides like vanadium oxide can be considered as a new beginning in the field of material science.