Electrical properties of (Na0.5K0.5)NbO3-(Sr0.5Ca0.5)TiO3 ceramics with the variation of sintering temperature
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Piezoelectric 0.94(Na0.5K0.5)NbO3-0.06(Sr0.5Ca0.5)TiO3 ceramics were fabricated by the mixed-oxide method and the structural and dielectric properties was investigated with the variation of the sintering temperature. All specimens were crystallized in the perovskite single phase without any formation of a second phase such as pyrochlore. The specimen sintered at 1200 o C showed the highest relative density of 98%. Electromechanical coupling factor, relative dielectric constant and dielectric loss of NKN-SCT specimens sintered at 1200 o C were 0.25, 2028 and 0.03, respectively. Curie temperature increased with increasing the sintering temperature, and the value of the specimen sintered at 1200 o C was 345 o C.
Abstract
Piezoelectric 0.94(Na0.5K0.5)NbO3-0.06(Sr0.5Ca0.5)TiO3 ceramics were fabricated by the mixed-oxide method and the structural and dielectric properties was investigated with the variation of the sintering temperature. All specimens were crystallized in the perovskite single phase without any formation of a second phase such as pyrochlore. The specimen sintered at 1200 o C showed the highest relative density of 98%. Electromechanical coupling factor, relative dielectric constant and dielectric loss of NKN-SCT specimens sintered at 1200 o C were 0.25, 2028 and 0.03, respectively. Curie temperature increased with increasing the sintering temperature, and the value of the specimen sintered at 1200 o C was 345 o C.
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