Dielectric, structural and absorption properties of Mg2+ substituted Ba2Zn2X hexa-ferrites for microwave devices and applications

Abstract

Electromagnetic devices have hazardous effects to the environment in the form of pollution. Materials having higher reflection loss and good absorption properties can overcome this pollution. This study synthesizes the Ba2Zn2-xMgxFe28O46 (x = 0.0, 0.1, 0.2, 0.3, and 0.4) using sol-gel method. The higher value of reflection loss of prepared samples was successfully achieved which can be used for absorption applications. X-ray diffraction patterns show a x-type hexagonal phase with crystallite's size ranged from 18 to 43 nm. All the vibrational bands shifted by changing the substitution in all compositions. Six distinct peaks in Raman spectra are located at positions 62, 174, 332, 408, 525, and 673 because of the molecules' phonon vibrations. The peaks were found in the XPS spectrum mode range of 1350-1 eV. All substitutions had a high dielectric constant, dielectric loss, and tan loss at low frequencies, but this value decreased as the frequency increased. The Cole-Cole plots and complex impedance spectroscopy revealed that grain boundary contributed for most dielectric responses. For these materials, cole-cole plots showed a complete semicircle, demonstrating the grain boundary resistance within the samples. Mg substituted Zn-X ferrite with RL of −69.3, and −62.0 dB are found to have excellent microwave absorption properties. The prepared samples could be used for absorption and super-capacitor applications.