Effects of Electrode on Dielectric Properties of Barium Iron Niobate Ceramics Doped with Gallium Oxide

Ba (Fe0.8Ga0.2)0.5Nb0.5O3 ceramics were synthesized via a solid state reaction method. The Raman spectrum analysis indicated that the sample presented a cubic structure. Dielectric measurement on the ceramics with Ag-paste and Au-sputtered electrodes showed that all ceramic samples exhibited very high dielectric constants with a strong frequency dispersion. The Au-sputtered electrode samples presented higher dielectric tunability the dielectric constant than Ag-paste electrode samples.This behaviour was related with the electrode effect, occured in the studied samples.