The Effects of K/Na Ratio on the Electrical Properties of (Li, Sb, Ta) Modified KNN Piezoelectric Ceramics at Reduced Temperature with KNbO₃ as Sintering Aid

Abstract:

0.95(Na_0.95-xK_xLi_0.05)(Nb_0.90Sb_0.05Ta_0.05)O₃-0.05KNbO₃ lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method, the effects of K/Na ratio on the structure and electrical properties of the ceramics were studied in detail. The results show that the addition of the pre-calcined KNbO₃ powder as sintering aid is very effective to improve the density and sinterability, and the ceramics could be well sintered at reduced temperature of 1060 °C as compared with the relatively higher sintering temperature of Li, Sb, Ta modified KNN ceramics reported in the literature at 1100-1220 °C. The ceramics with x=0.44 possess the optimal properties: d₃₃=231 pC/N, k_p= 47 %, P_r= 22 μC/cm², and E_c= 11.4 kV/cm.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 299-304
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.299
• Online since: February 2014
• Authors: Meng Meng Jia, Jian Ma*
• Keywords: Electrical Properties, K/Na Ratio, KNN, Lead-Free Piezoelectric Ceramics, Low-Temperature Sintering Technique

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