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Investigation on co‐fired multilayer KNN‐based lead‐free piezoceramics
Author(s) -
Gao Renlong,
Chu Xiangcheng,
Huan Yu,
Wang Xiaohui,
Li Longtu
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431156
Subject(s) - materials science , piezoelectricity , ceramic , laser doppler vibrometer , microstructure , electrode , tape casting , composite material , lead (geology) , optoelectronics , wavelength , chemistry , distributed feedback laser , geomorphology , geology
Potassium sodium niobate (KNN)‐based lead‐free piezoelectric ceramics were used to fabricate multilayer ceramics containing an Ag/Pd inner electrode via a tape casting and co‐firing process. The interfacial microstructure between the electrode and ceramic was characterised using a transmission electron microscope. The apparent electric‐field‐induced piezoelectric response was enhanced to 452 pm V −1 by the multilayer structure. A laser Doppler vibrometer was used to test the high frequency piezoelectric properties, and a remarkable apparent dynamic response of 1839 pm V −1 with a normalised thickness strain ( S max / E max ) of 369 pm V −1 was obtained at the resonance frequency 131.8 kHz. These results indicate that KNN‐based multilayer ceramics are promising substitutes for lead‐based ceramics as actuators and transducers.