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    Area of Science:

    • Materials Science
    • Acoustics
    • Piezoelectric Materials

    Background:

    • Standard "dice and fill" method (DFM) for 1-3 piezocomposites introduces spurious modes, limiting transducer performance.
    • Spurious modes near the thickness mode frequency can drastically reduce the effective operating frequency range of ultrasound transducers.

    Purpose of the Study:

    • To design and evaluate a novel 1-3 piezocomposite with a "super-cell" structure (13SC) to overcome DFM limitations.
    • To compare the electroacoustic performance of the 13SC composite with traditional DFM composites.

    Main Methods:

    • Fabrication of a 13SC piezocomposite using PZT and epoxy resin with two lateral periodicities and kerfs.
    • Fabrication of two regular 1-3 piezocomposites using DFM for performance comparison.
    • Measurement of electroacoustic responses in water for all fabricated composites.
    • Progressive thinning of samples to investigate performance evolution with increasing operating frequency (0.4 to 1.3 MHz).

    Main Results:

    • The 13SC composite exhibited stable performance across the entire tested frequency range (0.4-1.3 MHz).
    • Regular DFM composites showed performance limitations, consistent with numerical simulations.
    • The 13SC composite demonstrated superior usability and consistent characteristics compared to DFM composites.

    Conclusions:

    • The 13SC piezocomposite design effectively mitigates spurious modes inherent in DFM fabrication.
    • The 13SC composite offers a wider and more reliable operating frequency range for ultrasound transducer applications.
    • This novel structure presents a significant advancement for high-performance piezoelectric devices.