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Lithium tetraborate transducers.

A Ballato1, J A Kosinski, T J Lukaszek

  • 1US Army Electron. Technol. and Devices Lab., Fort Monmouth, NJ.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1991
PubMed
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Lithium tetraborate offers promising applications in frequency control and signal processing due to its unique piezoelectric properties. Specific orientations provide zero temperature coefficients for acoustic waves, enabling highly stable devices.

Area of Science:

  • Materials Science
  • Solid State Physics
  • Acoustics

Background:

  • Lithium tetraborate is a tetragonal crystal with potential for electronic applications.
  • Existing materials like lithium niobate and quartz have limitations in temperature stability or piezoelectric coupling.
  • Acoustic wave devices require materials with precise temperature-independent characteristics.

Purpose of the Study:

  • To investigate lithium tetraborate for frequency control and signal processing.
  • To identify specific crystallographic orientations in lithium tetraborate with zero temperature coefficients for acoustic waves.
  • To evaluate the suitability of these orientations for bulk wave resonators.

Main Methods:

  • Theoretical analysis of crystallographic orientations.

Related Experiment Videos

  • Calculation of temperature coefficients for bulk and surface acoustic waves.
  • Characterization of piezoelectric coupling and temperature sensitivity.

    • Main Results:

    • Identified two doubly rotated bulk wave resonator orientations in lithium tetraborate.
    • These orientations exhibit zero first- and second-order temperature coefficients.
    • The material shows piezoelectric coupling between lithium niobate and quartz.

    Conclusions:

    • Lithium tetraborate is a viable candidate for high-stability frequency control and signal processing.
    • The identified orientations are suitable for shear and compressional wave transducers.
    • These transducers offer low temperature sensitivity and moderately strong piezocoupling.