Microstructure and Piezoelectric Properties of (K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub>–BaTiO<sub>3</sub> Lead‐Free Piezoelectric Ceramics Modified by B<sub>2</sub>O<sub>3</sub>–CuO

Journal of the American Ceramic Society - Tập 93 Số 11 - Trang 3823-3827 - 2010
Kang Yan1, Kohei Matsumoto1, Tomoaki Karaki1, Masatoshi Adachi1
1Department of Intelligent Systems Design Engineering, Faculty of Engineering, Toyama Prefectural University, Imizu, Toyama 939‐0398, Japan

Tóm tắt

A combined sintering aid mixture of B2O3 and CuO for lead‐free piezoelectric ceramics having the composition 0.95K0.5Na0.5NbO3–0.05BaTiO3 (KNN‐BT) is introduced. The effects of the sintering aid mixture of 0.6B2O3–0.4CuO on the sintering behavior, microstructure, and electrical properties of KNN‐BT are investigated. Adding 2 wt% of the sintering aid mixture can effectively broaden the narrow sintering temperature range having a size of 20°C to above 50°C and increase the grain size of samples as well as maintain the high density of samples sintered at a low temperature. The increase in grain size contributes to an improvement in electrical properties. High piezoelectric properties of d33=205 pC/N, kp=38.0%, Qm=119, ɛ33T/ɛ0=1254, and tan δ=0.0264 are obtained for a KNN‐BT‐2wt% (B2O3–CuO) sample sintered at 1120°C.

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Thông tin xuất bản

Journal of the American Ceramic Society

Tập 93 Số 11

3823-3827

Thông tin tác giả