Structure and piezoelectric properties of K0.5Na0.5NbO3-Bi0.5Li0.5TiO3lead-free ceramics

Dunmin Lin, Kin Wing Kwok

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)

Abstract

Lead-free (1-x) K0.5Na0.5NbO3-xBi0.5Li0.5TiO3+ 1 mol% MnO2piezoelectric ceramics have been prepared by a conventional ceramic technique and their structure and piezoelectric properties have been studied. Our results reveal that Bi0.5Li0.5TiO3diffuse into K0.5Na0.5NbO3lattices to form a solid solution with a perovskite structure. The addition of Bi0.5Li0.5TiO3to the K0.5Na0.5NbO3solid solution decreases the paraelectric cubic-ferroelectric tetragonal phase transition temperature (TC) slightly, but shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperature (TO-T) significantly to low temperatures. As a result, coexistence of the orthorhombic and tetragonal phases is formed at 0.01 < x < 0.03 near room temperature, leading to a significant improvement in the piezoelectric properties of the ceramics. The ceramic with x = 0.025 exhibits a relatively high TC(392 °C) and optimum piezoelectric properties: d33= 191 pC/N, kp= 51.5% and kt= 45.5%. The ceramic also exhibit a good thermal stability of piezoelectric properties.
Original languageEnglish
Pages (from-to)501-505
Number of pages5
JournalJournal of Materials Science: Materials in Electronics
Volume23
Issue number2
DOIs
Publication statusPublished - 1 Feb 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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