X-ray diffraction, dielectric, and Raman spectroscopy studies of BaSrTiO3–NaNbO3 ceramic

Ba 0.837 Sr 0.093 Na 0.07 Ti 0.93 Nb 0.07 O 3 (BSNTN) ceramic was synthesized by the solid-state reaction at 1350 °C for 3 h. The crystal structure, investigated by X-ray diffraction at room temperature, revealed a single-phase perovskite crystallizing with tetragonal P4mm group space. Dielectric properties were investigated as a function of applied frequency. The ferroelectric behavior has been confirmed by hysteresis investigation. The evolution of the Raman spectra was used to study the variations of the basic phase transition of BaTiO 3 , at room temperature. It shows the introduction of a disorder in this composition, thus favoring a ferroelectric relaxor behavior.