Dielectric and piezoelectric properties of K0.5Na0.5NbO3- AgSbO3lead-free ceramics

Dunmin Lin, Kin Wing Kwok, H. L.W. Chan

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Abstract

Lead-free piezoelectric ceramics (1-x) K0.5Na0.5NbO3-x AgSbO3+0.75 mol % MnO2were prepared by a conventional solid-state sintering technique, and the piezoelectric and dielectric properties of the ceramics were studied. The results of x-ray diffraction suggest that AgSbO3diffuses into the K0.5Na0.5NbO3lattices to form a new solid solution with a single-phase orthorhombic perovskite structure. After the addition of AgSbO3, the paraelectric cubic-ferroelectric tetragonal phase transition temperature (TC) and the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperature (TO-T) decrease, and the ceramics become "softened," resulting in significant improvements in the ferroelectric and piezoelectric properties. The ceramics with x=0.03-0.10 exhibit excellent piezoelectric properties: d33=130-216 pC/N, kp=0.44-0.51, and kt=0.40-0.52. The ceramics also exhibit a good thermal stability up to high TO-T, suggesting that the ceramics are promising candidates for lead-free piezoelectric ceramics.
Original languageEnglish
Article number034102
JournalJournal of Applied Physics
Volume106
Issue number3
DOIs
Publication statusPublished - 28 Aug 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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