Influence of cation order on the dielectric properties of (1 – x)Pb(Sc_0:5Nb_0:5)O₃-xPb(Yb_0:5Nb_0:5)O₃ ceramics

Ceramic lead niobates and their solid solutions (1 – x)Pb(Sc_0:5Nb_0:5)O₃ – xPb(Yb_0:5Nb_0:5)O₃ were synthesized by solid state reactions from oxides. The structure of investigated samples was characterized by X-ray diffraction (XRD). Dielectric studies of the ceramics were performed by means of broadband dielectric spectroscopy at the temperature ranging from 600 K to 140 K. For all ceramic samples a diffuse phase transition as well as relaxor ferroelectric behavior were observed.