Effect of Li₂O Addition on Piezoelectric Properties of NKN-5LT Ceramics

Abstract:

Recently alkali oxide materials, such as sodium - potassium niobate have drawn much attention due to their ultrasonic applicability and are also considered as promising candidates for a piezoelectric lead-free system. However, it is difficult to sinter such NKN-based materials via conventional sintering process. Therefore, in this study, dense 0.95(Na0.5K0.5)NbO3-0.05LiTaO3 (NKN-5LT) ceramics were developed by conventional sintering process. Sintering temperature was lowered by adding Li2O as a sintering aid. The electrical properties of NKN-5LT ceramics were investigated as a function of Li2O concentration. At the addition of 1 mol% Li2O, electromechanical coupling factor (kP) and piezoelectric coefficient (d33) of NKN-5LT ceramics were found to reach the highest values of 0.37 and 250 pC/N, respectively.

• Periodical: Materials Science Forum (Volumes 534-536)
• Pages: 1525-1528
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.534-536.1525
• Online since: January 2007
• Authors: Min Soo Kim, Dae Su Lee, Eon Cheol Park, Soon Jong Jeong, In Sung Kim, Jae Sung Song
• Keywords: Lead-Free, Lithium Oxide, Piezoelectric, Sodium Potassium Niobate

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