Phase structure, microstructure, and electrical properties of Sb-modified (K, Na, Li) (Nb, Ta) O3 Piezoelectric Ceramics

Yunfei Chang, Zupei Yang, Lirong Xiong, Zonghuai Liu, Zenglin Wang

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32 Scopus citations

Abstract

Lead-free (K0.44Na0.52Li0.04)(Nb 0.80-xTa0.20Sbx)O3 piezoelectric ceramics were prepared by the ordinary sintering method. The much higher Pauling electronegativity of Sb compared with Nb makes the ceramics more covalent. By increasing x from 0.00 to 0.06, the phase structure of the ceramics changed from the tetragonal to the pseudocubic phase, and both the bands in the Raman scattering spectra shifted to lower frequency numbers. The grain growth of the ceramics was improved by substituting Sb5+ for Nb5+. By increasing x, the dielectric properties were optimized and the variation of dielectric constants before and after poling became smaller. Only the tetragonal-cubic phase transition was observed above room temperature in all the er-T curves. The degree of diffuseness increased from 1.29 at x50.00 to 1.96 at x50.06, indicating that the ceramics at x50.06 changed to an approximate ideal relaxor ferroelectric. The temperature dependences of fr and kp became better by increasing x properly. Significantly, the ceramics with x between 0.00 and 0.04 had high density and outstanding electrical properties (d33=241-272pC/N, kp=0.42-0.52, eτ51258- 1591, tan δ=0.015-0.025, Tc=2801-355°, E c510.62-12.60 kV/ cm, and Pr516.19-20.13 μC/cm2). Besides, the underlying mechanism for variations of the electrical properties due to Sb 5+ substitution was explained in this work.

Original languageEnglish (US)
Pages (from-to)2211-2216
Number of pages6
JournalJournal of the American Ceramic Society
Volume91
Issue number7
DOIs
StatePublished - Jul 1 2008

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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