Effect of alkali elements content on the structure and electrical properties of (K0.48Na0.48Li0.04)(Nb0.90Ta0.04Sb0.06)O3lead-free piezoelectric ceramics

Dunmin Lin, Kin Wing Kwok, Helen Lai Wa Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

21 Citations (Scopus)

Abstract

In this communication, we report on the effects of alkaline elements (K, Na, and Li) content on the electrical properties of (K0.48Na0.48Li0.04)(Nb0.90Sb0.06Ta0.04)O3ceramics. Because of the high volatility, the alkaline elements evaporate during the high-temperature sintering process, generating vacancy defects in the ceramics. As a result, the ferroelectric and piezoelectric properties of the ceramics become weakened. Our results reveal that the volatilization loss can be effectively compensated by a 1 mol% excess of alkaline elements. The remanent polarization Pr, piezoelectric coefficient d33, and electromechanical coupling coefficient kpof the compensated ceramics are improved by 15%, 16%, and 20%, respectively, having a value of 30 μC/cm2, 310 pC/N, and 0.6.
Original languageEnglish
Pages (from-to)2765-2767
Number of pages3
JournalJournal of the American Ceramic Society
Volume92
Issue number11
DOIs
Publication statusPublished - 1 Nov 2009

ASJC Scopus subject areas

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

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