Correlation between crystal structure parameters with magnetic and dielectric parameters of Cu-doped barium hexaferrite

Abstract

Copper (Cu) doped barium hexaferrite BaFe12−xCuxO19, (x = 0.0–2.0) were synthesized by the modified citrate sol-gel method. The structural, magnetic and electric properties have been investigated. All samples are crystallized to M-type hexagonal structure with P63/mmc space group. Lattice parameters are found to be maximum for x = 1.0, which has been correlated with the physical properties (magnetic & dielectric) of the material. The particle size distribution (found to be nm order) and surface morphology were analyzed by the FESEM (Field Emission Scanning Electron Microscopy) technique. The magnetic hysteresis (M-H) loops have been analyzed by employing the “Law of approach to saturation” and, important magnetic parameters are obtained. The saturation magnetization and magnetocrystalline anisotropy constants are found to be maximum for x = 1.0 sample, but the coercive field is found to a minimum for the same sample. The modified Debye equation has been employed to understand the impedance response to the frequency. The activation energy was obtained by using the Arrhenius equation. Hence, a correlation between crystal structure parameters and physical (magnetic and dielectric) properties of nano-crystalline Cu-doped barium hexaferrite has been observed. Finally, a correlation between crystal structure parameters and magnetic properties, as well as electrical properties, has been proposed for the Cu doped BHF.