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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.122  No.1426 (June) (2014)  >  pp.460-463

Journal of the Ceramic Society of Japan
<<Previous article Vol.122  No.1426 (June) (2014)   pp.460 - 463 Next article>>

Lead-free Li-modified (Na,K)NbO3 piezoelectric ceramics fabricated by two-step sintering method

Kensuke KATO1), Ken-ichi KAKIMOTO1), Keiichi HATANO2), Keisuke KOBAYASHI2), Yutaka DOSHIDA2)
1) Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology 2) Materials R&D Department, R&D Laboratory, Taiyo Yuden Co., Ltd.

Two-step sintering method has been applied to (Li0.06Na0.47K0.47)NbO3 (LNKN) ceramics in order to obtain a homogenous microstructure and high density (96.1% TD). The effects of the sintering temperature on the microstructure and electrical properties of LNKN ceramics were investigated. The two-step sintering has provided better densification at relatively lower temperature (≦950°C) than that of one-step sintering (1082°C), which suppresses the abnormal grain growth. In addition, the more homogeneous microstructure has been obtained by two-step sintering. The measured dielectric constant, dielectric loss and Curie temperature of the sample for two-step sintering were 666, 2.0% and 454°C, respectively, similar to the values obtained with one-step sintering. Nevertheless, LNKN ceramics prepared by two-step sintering showed higher coercive electric field (=18.8 kV/cm) than that revealed by one-step sintering (=13.0 kV/cm).


Keyword:
Lead-free, Piezoelectric ceramics, Two-step sintering

Received: December 02, 2013
Accepted: February 20, 2014 , Published online: June 01, 2014
Copyright © 2014 The Ceramic Society of Japan

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