Dielectric properties and electrical conductivity of LiNbO3:Zn crystals in the temperature range 310–900 К
Abstract Electrical conductivity and dielectric constant have been researched in a series of crystals LiNbO3:Zn(~4.0–9.0 mol% ZnО in a melt) by application of constant voltage with a couple of electrodes (~ 500 К). In order to compare results we have also researched electrical conductivity σdc of congruent LiNbO3congr and magnesium doped LiNbO3:Mg crystals. We have established that electron contribution to electrical conductivity of doped crystals LiNbO3:Zn and LiNbO3:Mg is greatly smaller than that of a congruent crystal LiNbO3congr. A decrease in conductivity is apparently connected with a restructure of LiNbO3 crystals at high concentrations of magnesium and zinc. Doping of crystals with Zn leads to drastic changes not only in the electron conductivity area (T   500 K). At this, parameters of temperature dependence of lithium ion conductivity depend on both zinc concentration and crystallographic orientation of samples.