Abstract
ABSTRACTIn this work, “pure” and doped (K0.48 Na0.52)NbO3 ceramics (KNN) were prepared by using Spark Plasma Sintering (SPS) method. In order to investigate the influence of doping elements on the microstructural, structural and dielectric properties of KNN, Cu2+ and Li1+ doping elements were added. The results revealed the viability to produce highly dense “pure” and doped KNN ceramics with good crystallization in the perovskite phase. Densities around 96% and 99% of the theoretical one were reached. In relation to pure KNN, it was verified that Cu2+ addition reduced significantly the sintering temperature, revealing a better microstructure with a more homogeneous grain size distribution and structure with well-defined splitting of the XRD peaks. In comparison to pure KNN, the addition of both doping elements decreased both the dielectric constant the dielectric losses as well.
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