Anaam W.Watana, Suad H.Aleabia, Ridha H. Risana, Kareem A. Jasima, Auday H. Shaban
Abstract
In the present paper, two-steps of solid state reaction method have used to prepare the homogeneous compound CdBa2-x SrxCa2Cu3O8+δ by substitution of strontium (Sr+2) into the barium (Br+2) sites, this substitutions were taken as x = 0.0, 0.20 and 0.30. The optimum calcinations were 800 C0 and for sintering within 845-850 C0.The structural was studied by using X-ray powder diffraction (XRD) and scanning electron microscope (SEM).The XRD analysis showed the structures a polycrystalline with tetragonal diagram and the change of the strontium concentrations produce a change in lattice parameters(a, b and c-axis). c/a, density of mass (ρm ), volume fraction (Vphase) and shore hardness for all our samples .It has been found that the optimum Tc(offset) = 113 K has been found for the composition CdBa2-x SrxCa2Cu3O8+δ with x = 0.30.The A.C electrical conductivity as a function of frequency is used to find the dielectric constant. It was found that changing in dielectric constant; dielectric loss factor and tangent loss were produced by increasing the Sr concentration
انعام وادي وطن | anaam wadi wattan | 7657