首页|Lead-free piezoelectric ceramics with ultralow mechanical quality factor

Lead-free piezoelectric ceramics with ultralow mechanical quality factor

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  • NETL
  • NSTL
  • Elsevier
The mechanical quality factor (Qm) is a key parameter in the applications of piezoelectric ceramics. For force sensors and acoustic transducers, low Qm allows a broadened frequency range for signal reception. Currently, the most popular low-Qm materials are lead-based ferroelectric ceramics, such as PbNb2O6. However, restrictive regulations on Pb-containing components have prompted the search for alternative lead-free piezoelectrics. Some studies on low-Qm lead-free ceramics have been reported, but without clarifying its origin. Here, lead-free piezoceramics with a nominal composition K0.475Na0.475Bi0.025Ag0.025Nb0.95Hf0.05O3 (KNN-BAH) were developed by a partial substitution of K and Na at A-sites with Bi and Ag, and the Nb at B-sites with Hf in K0.50Na0.50NbO3 (KNN). The KNN-BAH ceramics sintered at 1080 degrees C and 1120 degrees C showed Qm values of about 27.2 and 57.1, respectively, which are among the lowest values reported for lead-free piezoelectric ceramics. The ultralow Qm is attributed to the bi-phasic structure and enhanced domain wall motion.

Mechanical quality factorsK0.5Na0.5NbO3-based ceramicsFerroelectric ceramicsPiezoelectric applicationsELECTRICAL-PROPERTIESSINTERING TEMPERATUREGRAIN-SIZEFERROELECTRIC PROPERTIESCURIE-TEMPERATUREPHASE-TRANSITIONBARIUM-TITANATEMICROSTRUCTUREPERMITTIVITYSTABILITY

Gallardo-Duran, Johana Y.、Hu, Wanting、Koval, Vladimir、Herrera-Perez, Guillermo M.、Smith, Graham、Viola, Giuseppe、Yan, Haixue、Tang, Xuyao

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Queen Mary University of London School of Engineering and Materials Science||Ctr Invest Mat Avanzados SC

Queen Mary University of London School of Engineering and Materials Science

Slovak Acad Sci

Ctr Invest Mat Avanzados SC

University of Chester Faculty of Science and Engineering

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2025

10.1016/j.materresbull.2025.113560

Materials research bulletin

Materials research bulletin

SCI
ISSN：0025-5408
年,卷(期)：2025.191(Nov.)
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