Investigation on the effect of Ti doping on dielectric, impedance and magnetic properties of Ba super(2+)-substituted BiFeO sub(3) ceramics

Ti super(4+) substituted (Bi sub(0.9)Ba sub(0.1))(Fe sub(1-y)Ti sub(y))O sub(3) ceramics (0.0 less than or equal to y less than or equal to 0.15) were synthesized by auto combustion method. Rietveld refinement reveals a transformation from rhombohedral to tetragonal with the Ti super(4+) doping content at y = 0.05. Effect of Ti super(4+) doping on the dielectric properties of Ba super(2+) doped BiFeO sub(3) was studied from room temperature to 400 degree C in wide range of frequency. Initially, the dielectric loss was found to increase in ceramics with low Ti super(4+) content and then after decreases with further increase in Ti super(4+) concentration. The electrical conductivity of Bi sub(0.9)Ba sub(0.1)Fe sub(1-y)Ti sub(y)O sub(3) ceramics obeys the Arrhenius law, revealing the controlled conduction mechanism of oxygen vacancies at the higher range of temperature. The highest d sub(33) value of 15.8 pC/N was exhibited by the composition with Ti super(4+) doping at y = 0.05. Ti super(4+) doped BBFO ceramics showed similar behavior of weak ferromagnetism as Bi sub(0.9)Ba sub(0.1)FeO sub(3). Also, magnetization was found to increase with Ti super(4+) doping content up to 0.05 and then decreases with further increase in doping concentration.