Effect of sintering temperature on structure and dielectric behavior of 0.95(Bi0.5Na0.5)0.97(Li0.5Nd0.5)0.03TiO3–0.05BaTiO3 ceramics

Abstract

Lead free 0.95(Bi0.5Na0.5)0.97(Li0.5Nd0.5)0.03TiO3–0.05BaTiO3 (BNTLN0.03–BT5) ceramics were synthesized by conventional solid state reaction route. The effect of sintering temperature (Ts) on structure and dielectric behaviors of BNTLN0.03–BT5 ceramics is investigated systematically. With increasing Ts, the structure of BNTLN0.03–BT5 ceramics transforms from rhombohedral symmetry to pseudo-cubic symmetry. The grain size increases from ~4 to ~10 μm with increasing Ts. The dielectric constants er, dielectric losses tanδ and dielectric frequency dispersion increase gradually at room temperature with increasing Ts. The temperature stability coefficient fe of dielectric constant er and the diffuseness coefficient γ increases with increasing Ts. The sharp increase of dielectric constant er in the frequency of 1 kHz above Tm is suppressed with increasing Ts due to reducing Maxwell–Wagner polarization.