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<p>The piezoelectric properties of three types of bar-mode piezoelectric material element with lengths ranging from 5 to 8&#xa0;mm were evaluated for their piezoelectric properties using both a conventional measurement sample jig and a newly developed low-mechanical stress sample jig. The low-stress jig comprises an arm section fabricated from 6&#xa0;mm base, 70&#xa0;mm length and 0.1&#xa0;mm thickness A3104 aluminium alloy plate in a triangular shape with a pointed tip. A3104 aluminum alloy plate, The lower aluminum plate is constructed from A5182 aluminum alloy and includes a hemispherical protrusion with a diameter of 2&#xa0;mm. When the conventional side-to-side support type jig was used, many unwanted spurious vibrations modes appeared in the piezoelectric admittance spectra, resulting in lower mechanical quality factor <i>Q</i><sub>m</sub>, electromechanical coupling coefficient <i>k</i><sub>33</sub>, and piezoelectric constants <i>d</i><sub>33</sub> and <i>g</i><sub>33</sub>. In contrast, when the low-stress top to bottom support type jig was employed, the 0.73Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-0.27PbTiO<sub>3</sub> single crystals exhibited a spurious-free response, a 240% improvement in <i>Q</i><sub>m</sub> (from 265 to 645), a 11% increase in <i>d</i><sub>33</sub> (from 1370 to 1520 pC/N), and a 3% reduction in acoustic impedance (from 30.3 to 29.4 MRayls). These results suggest that the low-stress measurement jig could be beneficial for the development of medical and marine ultrasonic devices that use rod-shaped transducers.</p>

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Enhanced mechanical quality factor and piezoelectric constant of three types of piezoelectric resonator by new measurement sample jig

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Shintaro Matsumoto,
  • Hiroshi Maiwa,
  • Yu Xiang,
  • Yan Sun,
  • Osamu Furukawa,
  • Yohachi John Yamashita

摘要

The piezoelectric properties of three types of bar-mode piezoelectric material element with lengths ranging from 5 to 8 mm were evaluated for their piezoelectric properties using both a conventional measurement sample jig and a newly developed low-mechanical stress sample jig. The low-stress jig comprises an arm section fabricated from 6 mm base, 70 mm length and 0.1 mm thickness A3104 aluminium alloy plate in a triangular shape with a pointed tip. A3104 aluminum alloy plate, The lower aluminum plate is constructed from A5182 aluminum alloy and includes a hemispherical protrusion with a diameter of 2 mm. When the conventional side-to-side support type jig was used, many unwanted spurious vibrations modes appeared in the piezoelectric admittance spectra, resulting in lower mechanical quality factor Qm, electromechanical coupling coefficient k33, and piezoelectric constants d33 and g33. In contrast, when the low-stress top to bottom support type jig was employed, the 0.73Pb(Mg1/3Nb2/3)O3-0.27PbTiO3 single crystals exhibited a spurious-free response, a 240% improvement in Qm (from 265 to 645), a 11% increase in d33 (from 1370 to 1520 pC/N), and a 3% reduction in acoustic impedance (from 30.3 to 29.4 MRayls). These results suggest that the low-stress measurement jig could be beneficial for the development of medical and marine ultrasonic devices that use rod-shaped transducers.