Electrical, Structural, Magnetic and Transport Properties of Zn₂ Ba Fe₁₆ O₂₇ Doped With Cu²⁺

Series of polycrystalline samples of Zn_2-x Cu_x Ba Fe₁₆ O₂₇ were prepared by usual ceramic methods, where (x=0.0, 0.4, 0.6, 0.8, 1.0, 1.4) . X-ray analysis were obtained at room temperature using Cok_a with λ = 1.790A⁰ confirmed the presence of W-type hexaferrite phase structure . Saturation magnetization and hysteresis loops curves measurements at room temperature were studied as a function of Cu ²⁺ substitution . It can be seen that the Cu ²⁺ content slightly decreases the saturation magnetization from 25 to 20 (emug^-1), all hysterysis loops are closed which indicates low anisotropy field and low saturation magnetization field . The dc conductivity and thermoelectric power was measured in range from room temperature up to T = 750 K for all samples . The thermoelectric power decreases by increasing Cu ²⁺ content and the conductivity increases with temperature . The value of the charge carrier concentration increases by increasing temperature and Cu ²⁺ content.