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Abstract
Lead-free Na0.5K0.5(Nb1-xSbx)O3 (0<x<0.05) ceramics were fabricated by the solid-state reaction method and materials with more than 95% densification were obtained. A microstructure study confirms that the ceramics are well sintered. All compositions show complete perovskite solid solutions. Structural, dielectric and ferroelectric investigations for these specimens were performed. X-ray measurements showed that all compositions have a single perovskite structure with orthorhombic symmetry. Dielectric study revealed that the ceramics obtained are normal ferroelectrics. However some signs of diffuse phase transition were observed. The transition temperatures and the maximum electric permittivity were found to decrease and increase with increasing Sb content in the system, respectively, while ferroelectricity was enhanced significantly. A possible origin for these effects observed was discussed. The results could point to the possibility of application of Na0.5K0.5 (Nb1-xSbx)O3 as electronic ceramics.