Phase transition and piezoelectric properties of K0.48Na 0.52NbO3-LiTa0.5Nb0.5O 3-NaNbO3 lead-free ceramics

Feng Gao, Liangliang Liu, Bei Xu, Xiao Cao, Zhenqi Deng, Changsheng Tian

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Plate-like NaNbO3 (NN) particles were used as the raw material to fabricate (1 - x)[0.93 K0.48Na0.52Nb O 3-0.07Li(Ta0.5Nb0.5)O3]-xNaNbO 3 lead-free piezoelectric ceramics using a conventional ceramic process. The effects of NN on the crystal structure and piezoelectric properties of the ceramics were investigated. The results of X-ray diffraction suggest that the perovskite phase coexists with the K3Li2Nb 5O15 phase, and the tilting of the oxygen octahedron is probably responsible for the evolution of the tungsten-bronze-typed K 3Li2Nb5O15 phase. The Curie temperature (TC) is shifted to lower temperature with increasing NN content. (1 - x)[0.93 K0.48Na0.52NbO3-0. 07Li(Ta0.5Nb0.5)O3]-xNaNbO3 ceramics show obvious dielectric relaxor characteristics for x > 0.03, and the relaxor behavior of ceramics is strengthened by increasing NN content. Both the electromechanical coupling factor (kp) and the piezoelectric constant (d33) decrease with increasing amounts of NN. 0.01-0.03 mol of plate-like NaNbO3 in 0.93 K0.48Na0.52NbO 3-0.07Li(Ta0.5Nb0.5)O3 gives the optimum content for preparing textured ceramics by the RTGG method.

Original languageEnglish
Pages (from-to)6049-6055
Number of pages7
JournalJournal of Alloys and Compounds
Volume509
Issue number20
DOIs
StatePublished - 19 May 2011

Keywords

  • Dielectric relaxor
  • Lead-free ceramics
  • Phase transition
  • Piezoelectric property

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