中文摘要：

用常压烧结法制备 K0.5Na0.5NbO3陶瓷。研究烧结温度与陶瓷密度和电学性能的关系。研究表明在1065 ℃~1120 ℃范围内, 温度对陶瓷的密度有显著影响。当烧结温度为 1100 ℃时, 密度达到 4.35 g/cm3（占理论密度的 95%）; 1100 ℃烧结的陶瓷表现出最好的电学性能, 压电常数最大 118 pC/N, 相对介电常数最大538, 介电损耗最小 4.7%, 剩余极化强度为 15.37 μC/cm2, 矫顽场为 13.16 kV/cm。陶瓷样品在 206 ℃从正交结构转变到四方结构, 居里温度为 410 ℃。

英文摘要：

Lead-free piezoceramicsK0.5Na0.5NbO3were prepared by pressureless sintering. The effects of sintering temperature on the density and electrical properties of KNN ceramics were investigated. The results show that the den- sity of the KNN ceramics changes dramatically in a narrow temperature range of 1065-1120 ℃. The density of the ceramic sintered at 1100 ℃ reaches 4.35 g/cm3 （95% of the theoretical density）. The ceramic sintered at 1100 ℃ shows the best electrical properties： the maximum piezoelectric coefficient of about 118 pC/N, the maximum relative dielectric constant of 538, the minimum dielectric loss of 4.70%, the remanent polarization of 15.37 μC/cm2 and the coercive electric field of 13.16 kV/cm. The phase transformation temperature from orthorhombic to tetragonal is about 206 ℃, and the Curie temperature is 410 ℃.