Effect of CuO on the sintering and piezoelectric properties of 0.95(Na 0.5K0.5)NbO3-0.05SrTiO3 lead-free piezoelectric ceramics

In Tae Seo, Kyung Hoon Cho, Hwi Yeol Park, Seok Jung Park, Min Kyu Choi, Sahn Nahm, Hyeung Gyu Lee, Hyung Won Kang, Hwac Joo Lee

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33 Citations (Scopus)

Abstract

CuO was used to enhance the sinterability of 0.95(Na0.5K 0.5)NbO3-0.05SrTiO3 (0.95NKN-0.05ST) ceramics. The poor sinterability of 0.95NKN-0.05ST ceramics was improved by the addition of 1.5 mol% CuO, so that they were well sintered even at 960°C with grain growth. The densification and grain growth were attributed to liquid-phase sintering, probably due to the presence of a liquid phase containing SrO and CuO. The grain size decreased when the sintering temperature exceeded 960°C, due to the presence of a large amount of liquid phase. The microstructure of the 0.95NKN-0.05ST ceramics was considerably affected by even small variations of sintering temperature. The d33, kp, and Qm values increased with CuO addition due to the increased density and grain size. The high piezoelectric properties of kp=0.35, d33=200, and ε33To=1235 were obtained from the 0.95NKN-0.05ST ceramics containing 1.5 mol% CuO sintered at 960°C for 10 h.

Original languageEnglish
Pages (from-to)3955-3960
Number of pages6
JournalJournal of the American Ceramic Society
Volume91
Issue number12
DOIs
Publication statusPublished - 2008 Dec

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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