Microstructure and piezoelectric properties of ZnO-added (Na 0.5K0.5)NbO3 ceramics

Seung Ho Park, Cheol Woo Ahn, Sahn Nahm, Jae Sung Song

Research output: Contribution to journalArticle

210 Citations (Scopus)

Abstract

The orthorhombic structure of (Na0.5K0.5)NbO 3 (NKN) ceramics was maintained when ZnO was added. NKN ceramics have a porous microstructure and dissolve when they are exposed to water. However, as ZnO was added, a dense microstructure was developed and deliquescence was not observed. The mechanical quality factor (Qm) and coercive field (Ec) increased with the addition of ZnO, indicating that ZnO acted as a hardener in the NKN ceramics. The dielectric constant (ε3To), piezoelectric constant (d33) and electromechanical coupling factor (kp) increased when a small amount of ZnO was added, which might be due to the increase in density. The good dielectric and piezoelectric properties of ε3To = 500, d33 = 121 and kp, = 0.4 were obtained for the NKN ceramics with 1.0mol% ZnO.

Original languageEnglish
Pages (from-to)L1072-L1074
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume43
Issue number8 B
DOIs
Publication statusPublished - 2004 Aug 15

Keywords

  • (NaK)NbO
  • Deliquescence
  • Lead-free ceramics
  • Piezoelectric properties
  • ZnO

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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