LAUSR

Abstract Na 1−x Sr x (Sn 0.25 Ti 0.75 ) x Nb 1−x O 3 (SNSTNx) ceramics with composition (0.1 ≤ x ≤ 0.4) were synthesized by the conventional solid-state method. The purity, microstructure, dielectric, ferroelectric and Raman features were sought. This study demonstrated that antiferroelectricity can be stabilized in NaNbO 3 -based ceramics by lowering the tolerance factor. This compound exhibited a single phase of perovskite without impurity with tetragonal symmetry ( P 4 mm ). Micro structural investigations, using both XRD and SEM, indicated an enhancement of antiferroelectric super lattice peaks with SrSnO 3 and SrTiO 3 . The dielectric study showed that our new ceramics had better characteristics than pure NaNbO 3 and the relaxor behavior demonstrated the SNSTNx candidacy for use in several industrial applications. The ferroelectric behavior revealed that only ferroelectric domains existed in the prepared ceramic. In contrast, NaNbO 3 displayed the coexistence of antiferroelectric and ferroelectric domains. The Raman spectra of SNSTNx as a function of composition and temperature were also in favor of our dielectric results.