Electrical properties of SiO2-doped sodium metavanadate sintered discs

摘要

Impedance of sintered discs of 0.1, 0.25, 0.4 mol%of sodium metavanadate was measured in the frequency range 10kHz-1 MHz and in the temperature region from roomtemperature (=30℃)to 450℃. AC conductivity wascalculated from the data. DC conductivity wasmeasured in the temperature range 150-450℃. Debyetype of relaxation effects were observed in thedielectric loss. The activation energy of the dipolesinvolved in relaxation was estimated. The activationenergy for AC conduction in the temperature above 380℃ was calculated. These values are larger that theactivation energy of pure sodium metavanadate sample.The relaxation phenomenon observed is explained.