EPR and IR studies on the local structure of 80MoO3–20B2O3 glass

EPR lineshape simulation studies have been performed on a specimen of 80MoO3–20B2O3 glass in the temperature range of 300–77 K. The values of the obtained spin Hamiltonian parameters are: g∥=1.940, g⊥=1.974, A∥=150.0×10−4 cm−1, A⊥=35.6×10−4 cm−1 and g∥=1.935, g⊥=1.975, A∥=141.9×10−4 cm−1, A⊥=34.5×10−4 cm−1 at 300 and 77 K, respectively. The paramagnetic site in the specimen is molybdenyl, MoO3+, ion in which the Mo is in a distorted octahedral environment of six oxygen atoms with C4v symmetry. The 11-parallel and 11-perpendicular line feature of the EPR lineshape shows that two Mo nuclei are magnetically equivalent in the glassy matrix, in the temperature range 300–77 K.