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High Power Characteristics of Lead‐Free Piezoelectric Ceramics
Author(s) -
Lee Hyeong Jae,
Ural Seyit O.,
Chen Lei,
Uchino Kenji,
Zhang Shujun
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05462.x
Subject(s) - materials science , piezoelectricity , ceramic , dielectric , coercivity , dielectric loss , hardening (computing) , lead (geology) , composite material , mineralogy , optoelectronics , condensed matter physics , chemistry , physics , layer (electronics) , geomorphology , geology
High power characteristics of lead‐free ( Bi , Na ) Ti O 3 ( BNT ) and Ba Ti O 3 ( BT )‐based piezoceramics were investigated and compared to commercial “hard” Pb ( Zr , Ti ) O 3 PZT materials. Acceptor‐modified BNT and BT ‐based ceramics showed typical “hardening” characteristics, exhibiting high mechanical quality factor Q m > 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 Q m 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.