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Fabrication of PMN-PT/Epoxy 2–2 Composite Ultrasonic Transducers and Analysis Based on Equivalent Circuit Model

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Abstract

Single-crystal (1 − x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 (PMN-PT) has great potential for use in ultrasonic applications; however, it is challenging to achieve both broad bandwidth and high sensitivity owing to the mismatch in acoustic impedance between the piezoelectric materials and loading medium. Fabrication of a matching layer for transducers is challenging owing to the increase in the center frequency of the transducer. In this study, a 2–2 PMN-PT-crystal composite was designed and fabricated, exhibiting desirable piezoelectric properties and lower acoustic impedance compared with single-crystal PMN-PT. Transducers based on the 2–2 PMN-PT composite were fabricated and analyzed in detail to investigate their sensitivity and bandwidth. Moreover, the effects of a backing layer on the transducer were investigated. The measured results showed that the bandwidth improved from 21.28% to 35.54% at the cost of reduced sensitivity of the transducer. Systematic analysis of this phenomenon using an equivalent circuit based on the Mason model is presented.

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Acknowledgement

Financial support from the National Natural Science Foundations of China (11604251), National Key Research and Development Program of China (2017YFC0109703), National Key Project of Intergovernmental Cooperation in International Scientific and Technological Innovation (2016YFE0107900), and Natural Science Foundations of Shaanxi Province (2017JQ1006), and Xidian University (XJS16034, JBG161101) is greatly appreciated.

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Author notes

  1. Shang Hou and Xinyu Yang contributed equally to this work.

Authors and Affiliations

  1. School of Microelectronics, Xidian University, Xi’an, 740071, China

    Shang Hou, Xinyu Yang, Chunlong Fei, Xinhao Sun, Qiang Chen, Pengfei Lin, Di Li & Yintang Yang

  2. Roski Eye Institute, University of Southern California, Los Angeles, CA, 90089, USA

    Qifa Zhou

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  1. Shang Hou
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  2. Xinyu Yang
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  3. Chunlong Fei
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  4. Xinhao Sun
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  5. Qiang Chen
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  7. Di Li
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Correspondence to Chunlong Fei.

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Hou, S., Yang, X., Fei, C. et al. Fabrication of PMN-PT/Epoxy 2–2 Composite Ultrasonic Transducers and Analysis Based on Equivalent Circuit Model. J. Electron. Mater. 47, 6842–6847 (2018). https://doi.org/10.1007/s11664-018-6603-0

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  • DOI: https://doi.org/10.1007/s11664-018-6603-0

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