Structural and Electrical Properties of Lead-Free Ba(Sn,Ti)O3–(Na0.5K0.5)NbO3 Ceramics

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概要

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• (Na0.5K0.5)NbO3 with Ba(SnxTi1-x)O3 with $x < 0.1$ has been prepared by the conventional mixed oxide process. X-ray diffraction analysis revealed that, during sintering, all the Ba(SnxTi1-x)O3 diffuses into the lattice of (Na0.5K0.5)NbO3 to form a solid solution and the orthorhombic phase with a perovskite structure. The highest planar coupling factor of 0.98(Na0.5K0.5)NbO3–0.02Ba(Sn0.02Ti0.98)O3 ceramics is 0.31 after sintering at 1100 °C for 3 h. The samples with a low content of Ba(Sn0.06Ti0.94)O3 exhibit relatively good physical and electrical properties. For 0.98(Na0.5K0.5)NbO3–0.02Ba(Sn0.06Ti0.94)O3 ceramics, the electromechanical coupling coefficients of the planar mode $k_{\text{p}}$ and the thickness mode $k_{\text{t}}$ reach 0.18 and 0.46, respectively, after sintering at 1100 °C for 3 h. The ratio of the thickness coupling coefficient to the planar coupling coefficient is 2.56. With suitable Ba(SnxTi1-x)O3 concentration and sintering conditions, a dense microstructure and good electrical properties are obtained. Our results show that (Na0.5K0.5)NbO3–Ba(Sn0.06Ti0.94)O3 solid solution ceramics are promising lead-free ceramics for high-frequency electromechanical transducer applications.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2009-04-25

著者

• Wang Jun-jie

  Department Of Electrical Engineering National Cheng Kung University

• Wang Chun-huy

  Department Of Electronic Engineering Nan-jeon Institute Of Technolog

• Wang Jun-Jie

  Department of Electronic Engineering, Nan-Jeon Institute of Technology, Tainan, Taiwan 737, R.O.C.

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