Full set of material properties of lead-free PIC 700 for transducer designers

Fenu, N. G. , Giles-Donovan, N., Sadiq, M. R. and Cochran, S. (2021) Full set of material properties of lead-free PIC 700 for transducer designers. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 68(5), pp. 1797-1807. (doi: 10.1109/TUFFC.2020.3044790) (PMID:33315558)

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The impact of Pb on the environment and human health and recent restrictions on its use in electronic devices are generating demand for Pb-free piezoelectric materials. Examples are now available commercially, but the full elastic-piezoelectric-dielectric (EPD) matrices needed for device design, including over a range of operating conditions, have not yet been published. The standard IEEE EPD matrix measurement method needs four sample geometries, making it inconvenient and increasing errors. Here, we present an alternative method combining resonant ultrasound spectroscopy with optimization algorithms to measure the EPD matrix from a single exact cube sample. The Levenberg–Marquardt (LM) and Nelder–Mead (NM) optimizations are compared in refining the independent parameters. Both give convergent solutions, but the LM algorithm is more accurate and efficient. The single-sample approach was used to obtain results from Pb-free Na 1/2 Bi 1/2 TiO 3 (PIC 700, PI Ceramics, Lederhose, Germany) piezoceramic ( ∞ mm sample symmetry) characterized with the standard IEEE method at ambient temperature and with the single-sample method at ambient temperature and additionally up to 80 °C. The results are validated with the laser Doppler vibrometry via mode shape reconstruction and comparison with finite-element analysis (FEA). They demonstrate that convenient measurement of the EPD matrix of Pb-free materials with temperature dependence is possible, providing a crucial capability for the adoption of these materials in devices.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Cochran, Professor Sandy and Fenu, Dr Nicola and Giles-Donovan, Mr Nathan
Authors: Fenu, N. G., Giles-Donovan, N., Sadiq, M. R., and Cochran, S.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
ISSN (Online):1525-8955
Published Online:14 December 2020

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172921EPSRC 2016 Industrial Case Award (iCASE) - JaguarMiles PadgettEngineering and Physical Sciences Research Council (EPSRC)16000061 - EP/P510506/1Research and Innovation Services