Low temperature sintering of ZnO and MnO 2-added (Na 0.5K 0.5)NbO 3 ceramics

In Young Kang, In Tae Seo, Yu Joung Cha, Jae Hong Choi, Sahn Nahm, Tae Hyun Sung, Jong Hoo Paik

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

ZnO was used to decrease the sintering temperature of 1.5mol% MnO 2-added (Na 0.5K 0.5)NbO 3(MNKN) ceramics. When a small amount of ZnO (≥2.0mol%) was added, a dense microstructure was observed for specimens sintered at 960°C, with high relative density of 96.0% of the theoretical density. The liquid phase, which was considered to be an Nb 2O 5-MnO-ZnO related phase, was formed in the ZnO-added MNKN ceramics and abnormal grain growth occurred in its presence. Therefore, although a very small amount of ZnO might enter the matrix of the MNKN, most of the ZnO was used to form the liquid phase and assisted the densification of the specimens, indicating that the hardening effect of Zn 2+ was insignificant. The 2.0mol% ZnO-added MNKN (ZMNKN) ceramics sintered at 960°C exhibited the high piezoelectric properties of k p=37%, ε3T/ε0=297, d 33=120pC/N, and Q m=200. In addition, the reaction between the Ag electrode and the ZMNKN ceramic sintered at 960°C was negligible.

Original languageEnglish
Pages (from-to)2381-2387
Number of pages7
JournalJournal of the European Ceramic Society
Volume32
Issue number10
DOIs
Publication statusPublished - 2012 Aug

Keywords

  • Grain growth
  • Grain size
  • Low temperature sintering
  • Perovskite
  • Piezoelectric properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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