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

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25 Citations (Scopus)


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}T33/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
Issue number16
Publication statusPublished - 2014

Bibliographical note

Funding Information:
This work was supported by the Future Rail Technology Development Project, grant number of R1111203 (former KAIA, KICTEP) grant funded by the Ministry of Land, Transport and Maritime Affairs, Republic of Korea (Development of piezoelectric harvesting system for application of train).

Publisher Copyright:
© 2014 Elsevier Ltd.


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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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