Influence of sintering conditions on piezoelectric properties of KNbO3 ceramics

Dae Hyeon Kim, Mi Ri Joung, In Tae Seo, Joon Hur, Jong Hyun Kim, Bo Yun Kim, Hwack Joo Lee, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

A homogeneous KNbO3 (KN) phase was formed in specimens that were sintered at 1020°C and 1040°C, without formation of the K2O-deficient secondary phase, indicating that the amount of evaporation of K2O during sintering was very small. However, the KN liquid phase was formed during sintering and assisted the densification of the KN ceramics. A dense microstructure was developed in the specimen sintered at 1020°C for 6h and abnormal grain growth occurred in this specimen. A similar microstructure was observed in the specimens sintered at 1040°C for 1.0h. The dielectric and piezoelectric properties of the KN ceramics were considerably influenced by the relative density. The KN ceramics sintered at 1020°C for 6h, which showed a large relative density that was 95% of the theoretical density, exhibited promising electrical properties: e{open}T 33/e{open}o of 540, d33 of 109pC/N, kp of 0.29, and Qm of 197.

Original languageEnglish
Pages (from-to)4193-4200
Number of pages8
JournalJournal of the European Ceramic Society
Volume34
Issue number16
DOIs
Publication statusPublished - 2014

Keywords

  • KNbO
  • Lead-free piezoelectric ceramics
  • Liquid phase sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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