中文摘要：

铌酸钾钠基压电陶瓷（Na0.53K0.41Li0．06）Nb0．955Sb0．045O3的正交-四方多型相变在室温附近，具有良好的压电性能，但其温度稳定性很差。通过掺杂Bi2O3，使该陶瓷的正交-四方多型相变温度tO-T从15℃降低到了-9℃，同时保持了较高的居里温度tc（368℃），从而显著改善了其压电性能的温度稳定性。由于Bi^3＋施主掺杂作用和Sb^5＋较强的电负性，改性后的陶瓷保持了优良的电学性能：d53=213pC／N，kp=0．441，ε^T33=1319，tanδ=0．016。

英文摘要：

Potassium-sodium niobate based piezoelectric ceramics, （Na0.53K0.41Li0.06）Nbo.955Sb0.045O3 （NKLNS）, show excellent piezoelectric properties as their orthorhombic-tetragonal polymorphic phase transition temperature is colse to room temperature. However, the piezoelectric properties are unstable with the change of temperature. With the doping of Bi2O3, the orthorhombic-tetragonal phase transition temperature tot of the ceramics can be decreased from 15 ℃ to - 9 ℃, while the higher Curie temperature tc （368℃） can be maintained. Therefore the temperate stability of the piezoelectric properties of the ceramics is effectively improved. The Bi-modified ceramics exhibit excellent electrical properties with d33 = 213pC/N, kp= 0.441, ε^T33=I 319 and tanδ = 0.016, owing to the donor doping effect of Bi^3＋ and strong electronegativity of Sb^5＋.