Microstructure and piezoelectric properties of the CuO-added (Na0.5 K0.5) (Nb0.97 Sb0.03) O3 lead-free piezoelectric ceramics

Hwi Yeol Park, In Tae Seo, Min Kyu Choi, Sahn Nahm, Hyeung Gyu Lee, Hyung Won Kang, Byung Hyun Choi

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Abstract

The presence of the Sb5+ ion increased the piezoelectric properties of the (Na0.5 K0.5) NbO3 (NKN) ceramics by enhancing the poling state as identified by the increased phase angle (θ). The increased θ value was explained by the increased ferroelectricity due to the large electronegativity of the Sb5+ ion and the increased off centering of the cation due to the small ionic size of the Sb5+ ion. The (Na0.5 K0.5) (Nb0.97 Sb0.03) O3 [NK (N0.97 S0.03)] ceramics containing CuO were well sintered even at 960 °C. A small amount of the Cu2+ ions was incorporated into the matrix of the NK (N0.97 S0.03) ceramic and behaved as a hardener. The kp, Qm, d33, and ε3T / ε0 values of the CuO-added NK (N0.97 S0.03) ceramics were much higher than those of the CuO-added NKN ceramics due to the Sb5+ ion's enhancement of the piezoelectric properties by increasing the poling state of the specimens. The high piezoelectric properties of kp =0.41, Qm =1333, d33 =111 pC/N, and ε3T / ε0 =324 were obtained from the 2.0 mol % CuO-added NK (N0.97 S0.03) ceramics sintered at 960 °C for 8 h.

Original languageEnglish
Article number034103
JournalJournal of Applied Physics
Volume104
Issue number3
DOIs
Publication statusPublished - 2008 Aug 25

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piezoelectric ceramics
ceramics
microstructure
ions
hardeners
ferroelectricity
phase shift
cations
augmentation
matrices

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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Microstructure and piezoelectric properties of the CuO-added (Na0.5 K0.5) (Nb0.97 Sb0.03) O3 lead-free piezoelectric ceramics. / Park, Hwi Yeol; Seo, In Tae; Choi, Min Kyu; Nahm, Sahn; Lee, Hyeung Gyu; Kang, Hyung Won; Choi, Byung Hyun.

In: Journal of Applied Physics, Vol. 104, No. 3, 034103, 25.08.2008.

Research output: Contribution to journalArticle

Park, Hwi Yeol ; Seo, In Tae ; Choi, Min Kyu ; Nahm, Sahn ; Lee, Hyeung Gyu ; Kang, Hyung Won ; Choi, Byung Hyun. / Microstructure and piezoelectric properties of the CuO-added (Na0.5 K0.5) (Nb0.97 Sb0.03) O3 lead-free piezoelectric ceramics. In: Journal of Applied Physics. 2008 ; Vol. 104, No. 3.
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abstract = "The presence of the Sb5+ ion increased the piezoelectric properties of the (Na0.5 K0.5) NbO3 (NKN) ceramics by enhancing the poling state as identified by the increased phase angle (θ). The increased θ value was explained by the increased ferroelectricity due to the large electronegativity of the Sb5+ ion and the increased off centering of the cation due to the small ionic size of the Sb5+ ion. The (Na0.5 K0.5) (Nb0.97 Sb0.03) O3 [NK (N0.97 S0.03)] ceramics containing CuO were well sintered even at 960 °C. A small amount of the Cu2+ ions was incorporated into the matrix of the NK (N0.97 S0.03) ceramic and behaved as a hardener. The kp, Qm, d33, and ε3T / ε0 values of the CuO-added NK (N0.97 S0.03) ceramics were much higher than those of the CuO-added NKN ceramics due to the Sb5+ ion's enhancement of the piezoelectric properties by increasing the poling state of the specimens. The high piezoelectric properties of kp =0.41, Qm =1333, d33 =111 pC/N, and ε3T / ε0 =324 were obtained from the 2.0 mol {\%} CuO-added NK (N0.97 S0.03) ceramics sintered at 960 °C for 8 h.",
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