FTIR, Raman, EPR and optical absorption spectral studies on V2O5-doped cadmium phosphate glasses

Vanadium doped cadmium phosphate glasses xV2O5–(50−x)CdO–50P2O5 with 0≤x≤20 mol% were prepared and FTIR, Raman, EPR and optical absorption measured. Infrared and Raman investigations show the formation of P–O–V and V–O–V bonds, which replace P–O–P ones. The simulations of EPR spectra of most glass samples 2.5≤x≤10 mol% reveal a superposition of two resonance signals. Spin Hamiltonian parameters indicate that the VO2+ ions are present in octahedral sites with tetragonal compression and belong to C4v symmetry. The molecular bonding coefficient β12 and επ2 show an appreciable degree of covalency.