The infrared spectra of CdO-P2O5 and CdO-ZnO-P2O5 glasses

Abstract

The infrared absorption spectra of cadmium phosphate and cadmium zinc phosphate glasses were measured. The structure of cadmium phosphate glasses was found analogous to cadmium zinc phosphate glasses at 30% of ZnO but a further decrease in ZnO content causes a 30 to 40 cm -1 change towards higher wave number of the absorption band at the stretching frequency. Annealing at different temperatures does not show a prominent change in absorption band positions.

Infrared spectra of xCaO(1−x−z)SiO2zP2O5 glasses

“…It is assumed that the P-O-Ag stretching frequency is somewhat lower than a P-O-P stretching frequency. Ghauri and Hogarth [4] observed from the qualitative analysis of the infrared spectra of cadmium phosphate glasses that the phosphate tetrahedra dominates the structure of these glasses and that a partial covalent bond P-O-Cd would be created at higher cadmium content. On the basis of their observation, the bands at 640, 660 and 700 cm À1 can be attributed to a covalent bond between non-bridging oxygen and calcium ions as P-O-Ca stretching vibration.…”

“…The calcium phosphate glass exhibits diamagnetic behavior and the addition of iron to it leads to a paramagnetic behavior [2]. In recent years, the ultraphosphate region of different binary and anhydrous phosphate glass system was investigated by using IR, Raman, NMR, XRD, and XPS methods [3][4][5][6]. All these investigations obtained uniform result, i.e.…”