Abstract
High power characteristics of lead‐free (Bi,Na)TiO3 (BNT) and BaTiO3 (BT)‐based piezoceramics were investigated and compared to commercial “hard” Pb(Zr,Ti)O3 PZT materials. Acceptor‐modified BNT and BT‐based ceramics showed typical “hardening” characteristics, exhibiting high mechanical quality factor Qm > 800 and low dielectric loss, <0.01, comparable to “hard” PZT ceramics. Of particular significance is that BNT‐based ceramics were found to exhibit minimal variation of resonance frequency shift and high Qm under high level vibration velocity, being ~0.6% and ~800 at 0.25 m/s, respectively, due to the high domain stability associated with their high coercive fields, being on the order of 35 kV/cm.
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