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
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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 (T s) on structure and dielectric behaviors of BNTLN0.03–BT5 ceramics is investigated systematically. With increasing T s, 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 T s. The dielectric constants ε r, dielectric losses tanδ and dielectric frequency dispersion increase gradually at room temperature with increasing T s. The temperature stability coefficient f ε of dielectric constant ε r and the diffuseness coefficient γ increases with increasing T s. The sharp increase of dielectric constant ε r in the frequency of 1 kHz above T m is suppressed with increasing T s due to reducing Maxwell–Wagner polarization.
KeywordsBaTiO3 Piezoelectric Ceramic Dielectric Behavior Morphotropic Phase Boundary Ferroelectric Domain
This work was supported by the National Nature Science Foundation of China (61261012, 61361007 and 11364008) and Guangxi Key Laboratory of Information Materials (131001-Z).
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