Abstract
In order to solve the low temperature stability of electrical properties in KNN-based ceramics, (1−x)[(K0.5Na0.5)0.95Li0.05](Nb0.95Sb0.05)O3–xBaTiO3 [(1−x)KNLNS–xBT] lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method. The introduction of BT stabilizes the tetragonal phase of KNLNS ceramics at room temperature, results in a typical ferroelectric relaxor behavior, and shifts the polymorphic phase transition to below room temperature. Moreover, there is a strong BaTiO3 concentration dependence of relaxor behavior and electrical properties, and the ceramic with x=0.005 exhibits optimum electrical properties and typical relaxor behavior (d33=269pC/N, kp=0.50, ɛr=1371, tanδ=0.03, TC∼349°C and γ=1.88024). These results indicate that the BT is an effective way to improve the temperature stability as well as the electrical properties of KNN-based ceramics.
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