科研之友
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摘要
Potassium sodium niobate ceramic with a nominal composition of Na0.5K0.5NbO3 (NKN) was fabricated successfully by sintering at 1020-1100°C and normal pressure. The effect of sintering temperature on the density, structure and the electric properties of NKN ceramics were investigated. The results show that the crystal phase of the NKN ceramics is an orthorhombic structure similar to that of KNbO3 ceramics, a second phase formed when the sintering temperature is higher than 1080°C. The density of the sintered NKN ceramics changed dramatically in a narrow temperature range of 1020-1100°C. The density of the ceramics sintered at 1080°C reached a maximum value of 4.22 g/cm3 (92 of the theoretical density). The ceramic sintered at 1060°C shows a maximum piezoelectric coefficient of about 122 pC/N and a maximum Curie temperature of 409°C, and the coercive field and remanent polarization are 9 kV/cm and 15 μC/cm2, respectively.
