الفهرس 
Applications of ferritesOnly 14 pages are availabe for public view
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Abstract
The investigate some electrical and magnetic properties of the hexagon a1 ferrite BaCoz-, Ni,Fe160 27 where x=O.O, 0.4, 0.8, 1.2, and 1.6 The sanlples were prepared using the ceramic method. x-ray powder diffraction patterns for these compounds were obtained at room temperature by using Cu, Kal , radiation, which confirmed the presence of single phase W-type hexagonal structure of ferrite. Ac conductive, real I I dielectric constant(&’) and dielectric loss tangent(tan6) were studied as function of frequency, temperature and composition . Measurements carried out in an evacuated cell (10-3 torr), at frequencies (130Hz to 105 Hz ) using a complex impedance technique (low frequency Lock-in amplifier) over temperature range300 to 650K for samples (x=O.O, 0.4, and 0.8 ) and 300 to 4 11K for the sample with x=1.6 . The dc electrical conductivity, drift ni obility, therrli oelectric power coefficient and initial magnetic permeability were also studied as function of temperature and composition. 1- The lattice parameters a and c were found nearly constant with increasing Ni-con tent. 2- The theoretical density is greater than the experimental density for all samples. 3- The theoretical density is constant with Ni-substituation. but the experimental density slightly increased while the porosity slightly decreased with Ni-content. 4- The thermoelectric power values were negative for all sample, indicating that the majority charge carriers of the samples are electrons.