Abstract
Abstract In this research, we investigated the influence of Al-Mn substitution on the structural, dielectric and magnetic properties of M-type strontium hexagonal ferrites nanoparticles with chemical composition Sr1-xAlxFe11.4Mn0.6O19 (x=0.0, 0.1, 0.2), prepared by sol-gel auto-combustion technique and sintered at 950°C for 5 hours. XRD patterns show the formation of crystalline M-type hexagonal ferrites with traces of α -Fe2O3. FTIR gives the idea of the formation of M-type hexagonal ferrites by showing the presence of characteristics peaks at 438.94 cm-1 and 600.17 cm-1. FESEM shows that the sample exhibit platelet-like structure. The dielectric analysis was carried out in the frequency range 1 KHz to 5 MHz and explained on the basis of Koop’s phenomenological theory and Maxwell Wagner theory. The sample without doping exhibits the highest dielectric constant (1410). Low dielectric loss (0.829) was observed in the sample with x=0.1. The magnetic parameters such as coercivity, remnant and saturation magnetization increases with increase in Al-Mn concentration. High value of coercivity (Hc) (4597.58 Oe) was observed in the sample with x=0.2. The material may be useful for high frequency application.
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