Lead-free Li-modified (Na,K)NbO<sub>3</sub> piezoelectric ceramics fabricated by two-step sintering method

DOI Web Site 1 Citations 33 References Open Access
  • KATO Kensuke
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology
  • KAKIMOTO Ken-ichi
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology
  • HATANO Keiichi
    Materials R&D Department, R&D Laboratory, Taiyo Yuden Co., Ltd.
  • KOBAYASHI Keisuke
    Materials R&D Department, R&D Laboratory, Taiyo Yuden Co., Ltd.
  • DOSHIDA Yutaka
    Materials R&D Department, R&D Laboratory, Taiyo Yuden Co., Ltd.

Abstract

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).

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