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Comprehensive study of magnetic and dielectric properties at near room temperature of Ba1-xSrxFe12O19 (x=0, 0.5, 1) hexaferrite
Authors: Dhahri, A.; Hajji, A.B.; Moualhi, Y.; Dhahri, R.; Abdelmoula, N.; Costa, BFO
Ref.: Phys. B Condens. Matter. 772, 418082 (2025)
Abstract: Ba1-xSrxFe12O19 (x = 0; 0.5; 1) nano compounds have been prepared by the auto-combustion process. The physical properties have been studied exhaustively by different techniques. All samples crystallise according to the hexagonal symmetry with the (P63 /mmc) space group, as confirmed by the structural refinement using the Rietveld method. Thermal magnetisation measurement proves that the materials under investigation exhibit a second order magnetic phase transition from ferromagnetic FM phase to PM ones. The improvement of the anisotropy energy causes an increase of the coercive field, which increases from 2784.2 Oe (221.55 kA/m) to 3582.1 Oe (285.05 kA/m). The hardness factor kappa have been increased from 0.81 for BaFe12O19 to 0.89 SrFe12O19. Thus, shedding light on the semi-hard ferromagnetic behaviour of the materials under investigation. On the basis of dielectric study, the increased Sr substitution enhances the insulating nature of the material by introducing additional grain boundary barriers and reducing charge carrier mobility. Consequently, the conduction process becomes highly resistive, while polarization dominates the overall electrical response. This combination of high resistivity and strong capacitive character indicates excellent charge storage capability and minimal dielectric loss, making the Sr-rich composition a potential candidate for capacitor and dielectric energy storage applications requiring high stability and low leakage.
