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Analysis of structural, electrical, and magnetic properties of Sr0.5Ca0.5Fe12O19 and Ba0.5Ca0.5Fe12O19 for advanced technological application
Authors: Hantech, M.; Dhahri, R.; Dhahri, E.; Costa, B.F.O.
Ref.: Ceram. Int. 51(20B), 31734-31746 (2025)
Abstract: This study investigates the impact of calcium substitution on the structural, magnetic, and electrical conductivity properties of barium and strontium hexaferrites. X-ray diffraction analysis confirms that all samples retain a hexagonal crystal structure P63/mmc, with calcium incorporation maintaining lattice symmetry. The results align with the Aharoni model, showing an enhanced magnetic saturation and high transition temperature, making the material suitable for high-temperature electronic devices and applications requiring strong permanent magnets. Electrical conductivity measurements indicate semiconductor behavior consistent with Jonscher´s power law, with conduction mechanisms identified as Non-Overlapping Small Polaron Tunneling and Correlated Barrier Hopping. The activation energy for conduction in the high-temperature range was determined via the Small Polaron Hopping model, while lower-temperature conductivity was explained by Mott and Shklovskii-Efros Variable Range Hopping models. The Ghosh scaling model further confirmed that conductivity is influenced by Coulomb interactions between carriers.
