Influence of Ti-Substitution on Structural, Magnetic and Dielectric Properties of M-Type Barium Hexaferrite

Ti-doped M-type barium hexaferrite compounds (BaFe12-xTixO19, x=0-0.8) were prepared in single phase form. The lattice constant c is found to increase systematically with the concentration. Temperature variation of the magnetization measurement shows that all the samples exhibit ferrimagnetic transition with a systematic decrease in transition temperatures (T-c) from 720K for x=0-608K for x=0.8. The analysis of impedance spectra shows the deviation of relaxation process from the ideal Debye type and the relaxation of charge carriers across grains and grain boundaries is clearly elucidated by considering an equivalent electrical circuit. The analysis of conductivity data measured at different temperatures reveals that the conduction activation energy (E-c) decreases as the Ti concentration is increased. The present study demonstrates that Ti doped M-type barium hexaferrite compounds exhibit a moderate value of saturation magnetization and a low value of coercivity.