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Articles by O.M. Hemeda
Total Records ( 1 ) for O.M. Hemeda
  D. M. Hemeda and O.M. Hemeda
  Series of polycrystalline samples of Zn2-x Cux 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 COkα 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 Cu2+ substitution . It can be seen that the Cu2+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 Cu2+content and the conductivity increases with temperature . The value of the charge carrier concentration increases by increasing temperature and Cu2+content .
 
 
 
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