Synthesis of Cr M-type Hexagonal Ferrites by Sol-Gel Auto-Combustion Methods

Abstract

The basic formula of contaminant M-type hexagonal Ferrites is Ca_0.25Ba_0.75Cr_xFe_12-2xO₁₉, where x=(0.0, 0.05,0.10, 0.15, and 0.20) was synthesized by using sol-gel auto combustion method. X-ray diffraction (XRD) analysis was employed to determine the geometry of single-phase Cr hexaferrite. We investigated the structural, morphological, or dielectric characteristics. The samples were sintered at 1200^◦C for 8 hours. The Single-phase magneto plumbite form is revealed by the XRD analysis. The basic purpose of Ca_0.25Ba_0.75Cr_xFe_12-xO₁₉ hexaferrites, including lattice parameters (a or c), crystallite size, and cell volume V(Å)³, was assessed. The particle's crystallite size ranged from 45.85 to 42.96 nm. SEM analysis of the samples indicates a consistent platelet hexagonal shape and uniform distribution of all the grains. The materials morphological appearance as seen by using a scanning electron microscope (SEM), whereas microscopy displays uniformly scattered particles and a uniform platelets hexagonal shape. The rule for approximation towards the saturation magnetization (H_C) has been employed to explore saturation magnetization and magneto crystalline anisotropic. These produced samples such as quality factor(Q-values), ac conductivity, dielectric constant(έ), dielectric loss(ε″), tangent loss(tanδ) have also been studied. Such observed dielectric features were useful for greater applications like microwave absorber, voltage controlled, dielectric resonator and recording medium.