STRUCTURAL-PROPERTIES OF LEAD VANADATE GLASSES CONTAINING LA3+ OR FE3+ IONS

Structural properties of lead vanadate glasses containing La3+ or Fe3 ions were investigated using X-ray diffraction, Fourier transform inf rared spectroscopy and laser Raman spectroscopy. Crystalline Pb2V2O7 w as formed for the molar composition 66.7PbO-33.3V2O5. Incorporation of greater quantities of La3+ into lead metavanadate glass caused the cr ystallization of Pb2V2O7. Fourier transform infrared and laser Raman s pectra also suggested the presence of LaVO4. Incorporation of Fe3+ ion s into lead metavanadate glass, up to 20 wt % Fe2O3, did not cause cry stallization inside the glass matrix. Changes in the vibrational spect ra are discussed.