Abstract
BaFe12O19 and BaFe11.5Ti0.5O19 were prepared by three-step calcination method. Phase analysis and microstructural study were carried out by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Site occupancy of Ti4+ ions with calcination step were investigated by Fourier-transform infrared (FTIR) and Raman spectroscopy. The magnetic and microwave properties (Ku-band) were measured by vibration sample magnetometer and vector network analyzer. XRD patterns confirmed the hexaferrite phase formation in all samples. FTIR showed the presence of Ti4+ ions at spin down octahedral and tetrahedral sites. The peak shift in FTIR and Raman spectra suggested that ion occupancy increases with calcination step. A drastic decrease in the coercivity was observed with substitution. Low dielectric and magnetic losses in were observed in Ti substituted samples. SEM revealed that Ti substitution promotes hexagonal grain with decreased size. Overall microwave absorbance was greatly improved by three step calcination method.
Published Version
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