Effect of Ta content on phase structure and electrical properties of piezoelectric lead-free [(Na0.535K0.480) 0.942Li0.058](Nb1-xTax)O 3 ceramics

Pei Zhao, Rong Tu, Takashi Goto, Bo Ping Zhang, Shu Yang

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

The Li/Ta-codoped lead-free (Na,K)NbO3 ceramics with Na:K ratio of 0.535:0.480 were prepared by normal sintering, whose nominal formula was noted as [(Na0.535K0.480)0.942Li 0.058](Nb1-xTax)O3 (x=2, 4, 6, 8, 10, 12, 14, and 16 at.%). The X-ray diffraction patterns and the corresponding calculation of lattice parameters showed that a morphotropic phase boundary crossing orthorhombic and tetragonal symmetries occurs at the compositions containing 6∼8 at.% Ta. Because of such transitional behavior achieved by optimizing Ta content, the piezoelectric coefficient (d33), electromechanical coupling coefficient (kp), and dielectric constant (ε) were enhanced to peak values, 232 pC/N, 39.4%, and 710, respectively. However, the Curie temperature (TC) and remanent polarization (P r) show a decreasing tendency with raising Ta content, and their maximum values are 462°C and 8.73 μC/cm2, respectively.

Original languageEnglish
Pages (from-to)3440-3443
Number of pages4
JournalJournal of the American Ceramic Society
Volume91
Issue number10
DOIs
Publication statusPublished - 2008 Oct 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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