Structure and magnetic properties of Li-Cu ferrite

X-ray diffraction was used to study the formation and structure of mixed ferrite Li0.5-0.5xCuxFe2.5-0.5xO4 (where x = 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0). The X-ray diffraction pattern proved that the prepared samples were formed in the spinel structure. The samples with x less than or equal to 0.7 have cubic structure while the samples with x = 0.9, 1 have tetragonal structure. The experimental and theoretical lattice parameters (a(exp) and a(th)) were calculated for each composition. A comparison study between experimental and theoretical values was performed. The initial permeability mu(i) was measured as a function of temperature for the above-investigated ferrite. Utilizing the initial permeability data, the Curie temperature T-C was determined. T-C was found to decrease with increasing Cu2+ ion content. The anomaly seen in the temperature dependence of mu(i) was attributed to the existence of two structural phases (cubic and tetragonal phase). The magnetization M was measured at room temperature in the range of magnetizing field from 0 to 1307 Am-1. The calculated relative permeability showed a dependence on the magnetizing field and composition. In addition, the B-H loop was measured at room temperature and at constant magnetizing field H = 350 Am-1 The coercive force (H-c). remanence induction (B-r) and the apparent loss energy (P-s) were estimated. It has been found that both B-r and P-s are composition dependent while H-c is independent of composition.