Magnetic and microwave absorption of BaMgxZrxFe12-2xO19 polyaniline nanocomposites

magneticMg/Zr doped Barium Ferrite nanoparticlesBaMg(x)Zr(x)Fe(12-2x)O(19) (x = 0.25, 0.5, 0.75, 1, and 1.5) were synthesized successfully through sol-gel method and conducting BaFe12-2xMgxZrxO19/PANI (x = 0.25, 0.5, 0.75, 1, and 1.5) nanocompositeswere prepared by polymerization of aniline in the presence ofBaMg(x)Zr(x)Fe(12-2x)O(19) (x = 0.25, 0.5, 0.75, 1, and 1.5).The morphology, magnetic properties, crystal structure, and hexagonal phase of nanocomposites were measured using field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDXA), vibrating sample magnetometer (VSM), and X-ray diffraction (XRD) techniques. Microwave absorption properties of the nanocomposites with different thicknesses of 2, 3, 4 mm were measured through vector network analyzer (VNA). The main purpose was to investigate the effect of two different dopant concentrations (Zirconium and Magnesium) on the magnetic, microwave absorption, and morphology of nanocomposites. The VSM resultsdemonstrated that themagnetic properties of nanocomposites decrease by increasing the dopant concentration. Moreover, microwave absorption results demonstrated that the minimum S11 value for BaMg0.25Zr0.25Fe11.5O19 /PANI in 15.9 GHz and 9.6 GHz at the Ku and X bands reached to -49 dB and -37dB, respectively. In addition, the minimum Sll value is -39 dB for BaMg0.5Zr0.5Fe11O19. The microwave absorption results showed that the BaMg0.25Zr0.25Fe11.5O19/PANI nanocomposites have good potential for microwave applications as an absorber in the microwave region. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The magneticMg/Zr doped Barium Ferrite nanoparticles were synthesized successfully and nanocomposites were prepared by polymerization of aniline in the presence of these nanoparticles. The study investigated the effect of two different dopant concentrations (Zirconium and Magnesium) on the magnetic, microwave absorption, and morphology of nanocomposites. Results showed that the magnetic properties decrease with increasing dopant concentration, and some samples demonstrated good absorption ability in the Ku and X bands.