Effect of Low-Temperature Frit on the Sintering Behavior and Properties of 0.95K_0.49Na_0.51NbO₃-0.05LiSbO₃ Lead-Free Piezoceramics

Abstract:

The effects of low-temperature frit Li₂O-Na₂O-K₂O-B₂O₃-SiO₂-CaO-BaO-ZnO (abbreviated as BS) on the sintering behavior and electrical properties of 0.95K_0.49Na_0.51NbO₃- 0.05LiSbO₃ (abbreviated as KNN-LS) lead-free piezoceramics were investigated. The sintering temperature of the KNN-LS ceramics can be reduced from 1080 °C to 1000 °C due to the addition of BS frit. For the 0.5 wt% BS-doped KNN-LS ceramics, which are sintered at reduced temperature of 1000 °C for 2 h, remain relatively high piezoelectric constant d₃₃ (195 pC/N) and planar electromechanical coupling coefficient k_p (40.7%). In addition to other optimization effects, such as reduction of dielectric loss from 3.6% to 2.7% and increment of mechanical quality factor Q_m from 48 to 70, this BS frit was experimentally proved to be good for low temperature sintering of KNN-based ceramics while maintaining high piezoelectric response.

• Periodical: Advanced Materials Research (Volume 412)
• Pages: 290-293
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.412.290
• Online since: November 2011
• Authors: Zhu Mei Wang, Yue Ming Li, Run Run Li, Zong Yang Shen, Yan Hong
• Keywords: KNN, Lead-Free, Low-Temperature Frit, Piezoelectric Ceramic (PZT)

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