Abstract
In order to develop high temperature lead-free relaxors, xBiScO3−(1−x)(K0.5Na0.5)NbO3[xBS−(1−x)KNN] ceramics were proposed using a tolerance factor approach. To verify this proposal, xBS−(1−x)KNN ceramics were synthesized by conventional solid-state sintering. A stable perovskite phase was obtained when KNN content was greater than 96 mol %. The diffuse phase transition and frequency dispersion of the dielectric constant, which are two typical characteristics of relaxor ferroelectrics, were observed in xBS−(1−x)KNN ceramics. The dielectric relaxor behavior follows a modified Curie–Weiss law relationship. In addition, 0.04BS-0.96KNN ceramics show a broad and stable permittivity maximum near 2500 from 100 to 300 °C and lower dielectric loss (<5%) at broad temperature usage range (100–300 °C). The results indicate that this material may have great potential for high temperature capacitors in automobile applications.
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