Study of structural and electrical properties of ceramics SrBi₂Nb₂O₉ manufactured by high energy milling

Was synthesized compounds of bismuth, SrBi₂Nb₂O₉ (SBN) by the method of solid state by high energy milling reactor polymeric beads zirconia, and to it were added to concentrations of 3, 5, 10 and 15% bismuth oxide (Bi₂O₃) in order to promote intentional changes in the chemical structure of the ceramic. In this work we studied the structural and electrical properties (in the region of 10Hz to 100MHz). Was obtained diffractograms showing the formation of phase, and by Rietveld refinement confirmed the orthorhombic crystal structure with lattice parameter (a = 5.5129Å, b = 5.5183Å and c = 25.0819Å, α = β = γ = 90 deg) convergence rates for S = 1.59 (goodness of fit), where S is given by the ratio Rwp/Rexp. The dielectric permittivity and dielectric loss were directly related to the porosity using density measurements obtained. (author)