RAMAN-SPECTRA OF MOLYBDENUM PHOSPHATE-GLASSES AND SOME CRYSTALLINE ANALOGS

The Raman spectra of a series of glasses in the system MoO3‐P2O5 and the polyerystalline compounds molybdenum metaphosphate (MoO2(P03)2) and molybdenum pyrophosphate ((MoO2)2P2O2) are reported. The spectra indicate that traces of P=O and phosphate chains are present only in glasses having less than 50 mol% MoO3. Comparison of the glass spectra with spectra of crystalline molybdenum phosphates indicates the presence of metaphosphate and orthophosphate structural groups of MoO3 concentrations of about 50 mol% or less. As the MoO3 concentration is increased, the bands characteristic of pyrophosphate groups appear in the spectra and become the dominant feature at 76 mol% MoO3 concentration. Metaphosphate groups are present in the glass even at the highest MoO3 concentrations measured. Copyright © 1990, Wiley Blackwell. All rights reserved