Effect of Mn-Doping on the Piezoelectric Properties of (K0.5Na0.5)(Nb0.67Ta0.33)O3 Lead-Free Ceramics

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Published 16 May 2008 • Copyright (c) 2008 The Japan Society of Applied Physics
, , Citation Yoshiki Watanabe et al 2008 Jpn. J. Appl. Phys. 47 3556 DOI 10.1143/JJAP.47.3556

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1 Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

2 Noritake Co., Ltd., 300 Higashiyama, Miyoshi, Aichi 470-0293, Japan

Dates

  1. Received 22 January 2008
  2. Accepted 12 February 2008
  3. Published

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1347-4065/47/5R/3556

Abstract

The piezoelectric properties of 100(K0.5Na0.5)(Nb0.67Ta0.33)O3–x1/3Mn3O4 (abbreviated as KNNT–xMn) lead-free piezoelectric ceramics were investigated as a function of x. These ceramics were fabricated by conventional ceramics processing with K4.1CuTa7.7O22.3 (KCT) and ZnO as sintering aids. Mn-doping was found to decrease the phase transition temperature from tetragonal to orthorhombic (TO–T) near room temperature and clearly increase the d33 value. A high d33 value of 240 pC/N was obtained at x = 1.4. Values of kp and Qm kept were also maintained at over 0.40 and 280, respectively in the range of x = 0–2.0.

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10.1143/JJAP.47.3556