STRUCTURE AND ELECTRICAL-PROPERTIES OF LITHIUM NIOBOPHOSPHATE GLASSES

Lithium niobate glasses [(x.Nb2O5 (0.5 - x) P2O5) . 0.5Li(2)O] : y Fe2 O3 were studied using thermally stimulated depolarization and polariza tion current TSDC/TSPC, infrared (IR) spectroscopy, and X-ray powder d iffraction. Thermally stimulated polarization (TSPC) and depolarizatio n current (TSDC) techniques were used to study electrical polarization and conduction mechanisms in this system. Two current peaks were obse rved between 90 and 400 K. The first one is attributed to intrinsic di polar defects and the second to interfacial polarization. The DC condu ctivity depends on the Nb2O5/P2O5 ratio. Infrared absorption spectra i ndicate that ferroelectric LiNbO3 crystals are present for high niobiu m content samples.