Ba_(0.06)(Na,Bi)_(0.94)Ti_(1-x)(Ni_(1/3)Nb_(2/3))xO_3 Ceramics: X-ray Diffraction and Infrared Spectroscopy Studies

摘要

Non-lead ceramic samples ofBa_(0.06)(Na_(0.5)Bi_(0.5))_(0.94)Ti_(1-x)(Ni_(1/3)Nb2/3)xO_3;0 ≤x≤1.0 were prepared by standard high temperature ceramic synthesis method. Rietveld refinements of X-ray diffraction data of these ceramics were carried out using FullProf software and determined their crystal symmetry, space group and unit cell dimensions. Rietveld refinement revealed that Ba_(0.06)(Na_(0.5)Bi_(0.5))_(0.94)TiO_3 has a monoclinic structure with space group P4/m while Ba_(0.06)(Na_(0.5)Bi_(0.5))_(0.94)(Ni_(1/3)Nb2/3)O_3 has tetragonal (pseudo-cubic) structure with space group P4/mmm. Partial replacement of Ti~(4+) ion by pseudo-cation (Ni~(3+)_(1/3)Nb~(5+)_(2/3))~(4+) resulted in the change of unit cell structure from monoclinic to tetragonal. SEM studies were carried out in order to access the quality of the prepared ceramics which showed a change in grain sizes with the increase of {formula} content. FTIR spectra confirmed the formation of perovskite type solid solutions.