Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 118, Issue 4, Pages 1177-1181Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-015-9004-8
Keywords
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Funding
- National Natural Science Foundation of China [61371016, 11404107]
- National Key Technology R&D Program in the 12th Five year Plan of China [2012BAI13B02]
- Natural Science Foundation of Hubei [2013CFB060]
- Fundamental Research Funds for the Central Universities [2014TS043]
- National Key Scientific Instrument and Equipment Development Projects of China [2013YQ160551]
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Based on new KNN-based piezoelectric material 0.96(K0.48Na0.52)(Nb0.95Sb0.05)O-3-0.04Bi(0.5)(Na0.82K0.18)(0.5)ZrO3 with a giant d(33) of 490, a 37-MHz high-frequency ultrasound needle transducer with the aperture size of 1 mm was successfully fabricated. The obtained transducer had a high electromechanical coupling factor k (t) of 0.55, a good bandwidth of 56.8 % at -6 dB, and a low insertion loss of -16 dB at the central frequency. Its excellent performance is comparable to lead-containing transducer and is superior to that of any other lead-free transducer. This promising result demonstrates that this new KNN-based lead-free piezoelectric ceramic is a good candidate to replace lead-based materials for high-frequency ultrasound imaging.
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