Low-temperature sintering and piezoelectric properties of CuO -added KNbO 3 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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16 Citations (Scopus)


Dielectric and piezoelectric properties of CuO-added KNbO3 (KN) ceramics were investigated. The CuO reacted with the Nb2O5, formed a CuO-Nb2O5-related liquid phase during the sintering, and assisted the densification of the KN ceramics at low temperatures. Moreover, some of the Cu2+ ions replaced the Nb5+ ions in the matrix and behaved as a hardener. The dielectric and piezoelectric properties of the KN ceramics were considerably influenced by the relative density. The 1.0 mol% CuO-added KN ceramic sintered at 960°C for 1.0 h, which showed a maximum relative density, exhibited a high phase angle of 86.9°, Pr of 14.8 μC/cm2, and Ec of 1.8 kV/mm. This specimen also exhibited good dielectric and piezoelectric properties: εT 33o of 364, d33 of 122 pC/N, kp of 0.29, and Qm of 611.

Original languageEnglish
Pages (from-to)3897-3903
Number of pages7
JournalJournal of the American Ceramic Society
Issue number12
Publication statusPublished - 2014 Jan 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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