caa a22 4500 463211278 CHVBK 20180405153141.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s00339-007-3971-3 doi (NATIONALLICENCE)springer-10.1007/s00339-007-3971-3 Lead-free transducer for non-destructive evaluation [Elektronische Daten] [G.C. Edwards, S.H. Choy, H.L.W. Chan, D.A. Scott, A. Batten] Lead-free piezoelectric ceramics with the formula 0.90(Bi0.5Na0.5)TiO3 - 0.05(Bi0.5K0.5)TiO3 - 0.015(Bi0.5Li0.5)TiO3-0.05BaTiO3 (abbreviated as BNKLBT-1.5) were prepared by a conventional mixed-oxide method. A disc of this material was fabricated and used to construct an ultrasonic transducer suitable for use in non-destructive evaluation (NDE). Using a laser vibrometer, it was observed that both BNKLBT and PZT exhibited a surface displacement pattern indicative of coupling of the radial mode vibration with the thickness mode vibration. This is consistent with the measurements of electrical impedance vs frequency which showed that for both discs a strong radial mode with many harmonics was clearly observed and many (usually undesired) modes existed near the thickness mode resonance frequency. The discs were mounted in stainless steel housings with appropriate electrical connections to form transducers. Tungsten/epoxy backing was incorporated to provide a very short ring-down time, a characteristic required for many NDE applications. The characteristics of the BNKLBT transducer were quite similar to that of a PZT transducer of similar structure, showing that this lead-free material has the potential to replace PZT in transducers for NDE applications. Springer-Verlag, 2007 Edwards G.C. CSIRO Industrial Physics, P.O. Box 218, 2070, Lindfield, NSW, Australia aut Choy S.H. Department of Applied Physics, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, P.R. China aut Chan H.L.W. Department of Applied Physics, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, P.R. China aut Scott D.A. CSIRO Industrial Physics, P.O. Box 218, 2070, Lindfield, NSW, Australia aut Batten A. CSIRO Industrial Physics, P.O. Box 218, 2070, Lindfield, NSW, Australia aut Applied Physics A Springer-Verlag 88/1(2007-07-01), 209-215 0947-8396 88:1<209 2007 88 339 https://doi.org/10.1007/s00339-007-3971-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-3971-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Edwards G.C. CSIRO Industrial Physics, P.O. Box 218, 2070, Lindfield, NSW, Australia aut NATIONALLICENCE 700 1- Choy S.H. Department of Applied Physics, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, P.R. China aut NATIONALLICENCE 700 1- Chan H.L.W. Department of Applied Physics, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, P.R. China aut NATIONALLICENCE 700 1- Scott D.A. CSIRO Industrial Physics, P.O. Box 218, 2070, Lindfield, NSW, Australia aut NATIONALLICENCE 700 1- Batten A. CSIRO Industrial Physics, P.O. Box 218, 2070, Lindfield, NSW, Australia aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 88/1(2007-07-01), 209-215 0947-8396 88:1<209 2007 88 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer