ZnCr 2 O 4 'in NEM ALGILAMA DAVRANIŞININ K 2 CrO 4 EKLENEREK GELİŞTİRİLMESİ

The effects of the addition of various percentages of potassium chromate as a sintering aid on the response to air moisture of ZnCr2O4 spinel ceramic body were studied. Only the material containing 20% K2CrO4 in ZnCr 2 O 4 exhibited an exponential behaviour to humidity, which shows about three orders change in the . c . d resistance over the relative humidity ) (RH range between 25 and 90%. It was concluded that conduction is due mainly to protonic motion and is controlled through the thin layers of water, adsorbed on the surface of the grains, with charge transfer to the metallic electrodes. Based on . c . a impedance measurements, an equivalent circuit associated with a network of RC parallel circuit in series with constant phase elements (CPEs) has been suggested.