Effects of Sb content on electrical properties of lead-free piezoelectric (K 0.4425Na 0.52Li 0.0375) (Nb 0.9625-xSb xTa 0.0375)O 3 ceramics

Xuming Pang, Jinhao Qiu, Kongjun Zhu, Yang Cao

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Lead-free (K 0.4425Na 0.52Li 0.0375) (Nb 0.9625-xSb xTa 0.0375)O 3 piezoelectric ceramics were prepared by the conventional sintering method. The effects of the Sb content on the phase structure, microstructure, dielectric, piezoelectric, and ferroelectric properties of the (K 0.4425Na 0.52Li 0.0375) (Nb 0.9625-xSb xTa 0.0375) O 3 ceramics were investigated. The much higher Pauling electronegativity of Sb compared with Nb makes the ceramics more covalent. By increasing x from 0.05 to 0.09, all samples exhibit a single perovskite structure with an orthorhombic phase over the whole compositional range, and the bands in the Raman scattering spectra shifted to lower frequency numbers. The grain growth of the ceramics was improved by substituting Sb 5+ for Nb 5+. Significantly, the (K 0.4425Na 0.52Li 0.0375) (Nb 0.8925Sb 0.07Ta 0.0375) O 3 ceramics show the peak values of the piezoelectric coefficient (d 33), electromechanical coupling coefficient (k p), and dielectric constant (ε), which are 304 pC/N, 48% and 1909, respectively, owing to the densest microstructure of typical bimodal grain size distributions. Besides, the underlying mechanism for variations of the electrical properties due to Sb 5+ substitution was explained in this work.

Original languageEnglish
Pages (from-to)1249-1254
Number of pages6
JournalCeramics International
Volume38
Issue number2
DOIs
Publication statusPublished - 2012 Mar
Externally publishedYes

Keywords

  • Dielectric properties
  • Piezoelectric properties
  • Sintering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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