High Power Piezoelectric Characteristics for Perovskite-Type Lead-Free Ferroelectric Ceramics

摘要

High power piezoelectric characteristics of perovskite-type lead-free ferroelectric ceramics, 0.88(Bi_0.5Na_0.5) TiO₃-0.04(Bi_0.5Li_0.5)TiO₃-0.08(Bi_0.5Na_0.5)TiO₃ + MnCO₃ 0.4Â wt% [BNLKT4-8Mn0.4] and KNbO₃ + MnCO₃ 0.8 wt% [KN-Mn0.8], were focused on under large-amplitude vibration as compared with those of Pb(Zr,Ti)O₃ [PZT]-based ceramics. The maximum vibration velocities, v _o-p for BNLKT4-8Mn0.4 and KN-Mn0.8 reached larger than 2 m/s. A mechanical quality factor, Q_m, at large-amplitude vibration for all compositions including PZT-based ceramics decreased with increasing the v _o-p. The Q_ms of BNLKT and KN ceramics were smaller than that of hard PZT [N6] at the small-amplitude vibration. However, at the large amplitude vibration level of v _o-p 0.6 m/s, Q_m values of BNLKT and KN are larger than that of N6. Therefore, lead-free piezoelectric ceramics such as BNLKT-Mn0.4 and KN-Mn08 possess superior mechanical stability at large-amplitude vibration. This is very good sign for high power piezoelectric applications.View full textDownload full textKeywordsLead-free, high power piezoelectric properties, potassium niobate, bismuth sodium titanateRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/10584587.2010.488548