The fine-grained KNN-LN ceramics densified from nanoparticles obtained by an economical sol-gel route

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• 作者：Yudong Hou ; ^{ydhou@bjut.edu.cn} ; Chao Wang ; Jingli Zhao ; Haiyan Ge ; Mankang Zhu ; Hui Yan
• 关键词：Chemical synthesis ; Ceramics ; Piezoelectricity
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 出版时间：15 May, 2012
• 年：2012
• 卷：134
• 期：1
• 页码：518-522
• 全文大小：899 K

文摘

(1 ?#xA0;x)(K_0.5Na_0.5)NbO₃-xLiNbO₃ ((1 ?#xA0;x)KNN-xLN) nanoparticles with the mean particle size about 20-30 nm have been prepared by an economical sol-gel routes using Nb₂O₅ as Nb source. Due to the high sintering ability of nano-particles, fine-grained KNN-LN lead-free ceramics have been densified at the temperature below 1000 ¡ãC. X-ray diffraction analysis indicated that the phase structure of the ceramics changed from orthorhombic to tetragonal at x = 0.08-0.10. When the x reached 0.10 and above, the perovskite structure could not be maintained and the impurity phases of K₃Li₂Nb₅O₁₅ and LiNbO₃ appeared, indicating that x = 0.10 is near the solubility limit. Optimized parameters, such as d₃₃ = 170 pC/N and k_p = 0.40, were achieved in 0.90KNN-0.10LN systems. Due to the merits of fine-grained structure and low sintering temperatures, it will be helpful to the application of KNN-LN materials for lead-free multilayer piezoelectric actuator.