Shear-mode piezoelectric properties of modified-(K,Na)NbO3 ceramics for "hard" lead-free materials

Jong Bong Lim, Shujun Zhang, Hyeong Jae Lee, Jae Ho Jeon, Thomas R. Shrout

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


(K0.45Na0.55)NbO3-0.5 mol% K 4CuNb8O23 [KNN-KCN] solid solution was synthesized and its shear mode dielectric and piezoelectric properties were characterized as a function of temperature. The doped KNN material was found to possess comparable electric resistivity, piezoelectric, and electromechanical properties with pure KNN, but with a much higher mechanical Qm value, being on the order of 1500. The dielectric permittivity K11 T and piezoelectric coefficients d15 for KNN-KCN were found to increase with the increasing temperature, while the electromechanical coupling factors k15 maintain a similar value till the phase transition temperature (To-t∼200°C), above which, the properties drop significantly due to depolarization. The good temperature-dependent properties, together with its high mechanical Q m, demonstrate a practical potential of KNN-KCN materials for high power shear-mode applications.

Original languageEnglish (US)
Pages (from-to)2519-2521
Number of pages3
JournalJournal of the American Ceramic Society
Issue number9
StatePublished - Sep 2010

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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