Etudes electrique et Raman de borotungstates et de boromolybdates de lithium vitreux

Conductivity studies of glasses obtained from the B ₂O ₃Li ₂OLi ₂MoO ₄ and B ₂O ₃Li ₂OLi ₂WO ₄ systems have been carried out. The presence of the transition element in tetrahedral coordination and with two different oxidation states is discussed. A Raman spectroscopy study shows that the MoO ₄ or WO ₄ tetrahedra are slightly compressed by the network forming lattice.