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Microscale 1‐3‐Type (Na,K)NbO 3 ‐Based Pb‐Free Piezocomposites for High‐Frequency Ultrasonic Transducer Applications
Author(s) -
Shen ZongYang,
Li JingFeng,
Chen Ruimin,
Zhou Qifa,
Shung K. Kirk
Publication year - 2011
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.1551-2916.2011.04508.x
Subject(s) - microscale chemistry , ultrasonic sensor , transducer , materials science , acoustics , physics , mathematics , mathematics education
Fine‐grained Pb‐free (Na 0.535 K 0.485 ) 0.95 Li 0.05 (Nb 0.8 Ta 0.2 )O 3 (NKLNT) piezoceramics prepared by spark plasma sintering (SPS) technique was used to fabricate NKLNT/epoxy 1‐3 composites with a modified dice–fill method. Because of its good machinability, SPSed NKLNT ceramic rods could be miniaturized to a lateral width of 50 μm. After lapping down to 56 μm in thickness, the composite was used to fabricate an ultrasonic transducer as the active piezoelectric element. This composite transducer showed a bandwidth at −6 dB nearly 90% at a center frequency of 29 MHz, demonstrating that this Pb‐free composite thick film is very promising for the fabrication of high‐frequency ultrasonic transducers in medical imaging applications.