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

201 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 (ε3 To), 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 ε3 To = 500, d33 = 121 and kp, = 0.4 were obtained for the NKN ceramics with 1.0mol% ZnO.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume43
Issue number8 B
DOIs
Publication statusPublished - 2004 Aug 15

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ceramics
microstructure
Microstructure
Electromechanical coupling
Permittivity
hardeners
dielectric properties
Water
Q factors
permittivity
water

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Microstructure and piezoelectric properties of ZnO-added (Na 0.5K0.5)NbO3 ceramics. / Park, Seung Ho; Ahn, Cheol Woo; Nahm, Sahn; Song, Jae Sung.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 43, No. 8 B, 15.08.2004.

Research output: Contribution to journalArticle

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AU - Song, Jae Sung

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AB - 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 (ε3 T/εo), 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 ε3 T/εo = 500, d33 = 121 and kp, = 0.4 were obtained for the NKN ceramics with 1.0mol% ZnO.

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