Study of ceramic materials in the SrSnO3-NaNbO3 system by X-ray diffraction, dielectric and Raman spectroscopy

Ceramics with composition belonging to the SrSnO3-NaNbO3 system were sintered in the temperature range 1100-1350 deg. C. The symmetry, dielectric properties and Raman spectroscopy were investigated. X-ray diffraction results demonstrate that a region with the cubic or tetragonal phases lies in the composition range x < 0.89 and x ≥ 0.89, respectively. The thermal behavior of the dielectric permittivity suggests the existence of two phases: cubic-paraelectric and tetragonal-ferroelectric or ferroelectric relaxor. The Raman spectra was recorded at room temperature and their evolution related to the chemical composition.