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

Abstract Conductivity studies of glasses obtained from the B 2 O 3 Li 2 OLi 2 MoO 4 and B 2 O 3 Li 2 OLi 2 WO 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.