Sintering temperature dependence of optimized microstructure formation of BaFe12O19 using sol–gel method

• Published in: Journal of materials science. Materials in electronics 2015-03, Vol.26 (3), p.1363-1367
• Main Authors: Kanagesan, S., Hashim, M., Kalaivani, T., Ismail, I., Rodziah, N., Ibrahim, I. R., Rahman, N. A.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Materials Science; Optical and Electronic Materials
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-014-2547-1

In an attempt to obtain the best possible properties of barium hexaferrite (BaFe 12 O 19 ), the sol–gel synthesis method was chosen and, the optimum sintering conditions were established. The effects of the sintering temperature on the structural, morphological and magnetic properties of hexaferrite were studied. X-ray analysis indicates that the sintered samples (1,000–1,150 °C) remained in the hexagonal structure. From this analysis, no secondary phases are identified. The effect of sintering temperature on the grain growth of BaFeBaFe 12 O 19 is confirmed by the microstructure using HR-SEM and is in good agreement with the XRD analysis based on the peak intensity of the (107) plane. The samples sintered at 1,150 °C showed the densities as ~93 % of theoretical density. Sintering temperature affected the grains in compact samples. The results show that homogeneous and dense BaFeBaFe 12 O 19 ceramics obtained at a lower sintering temperature of 1,150 °C which is lower than the normally reported sintering temperature of ≥1,200 °C. The thermal treatment can markedly affect the grains in compact samples.