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Dielectric and Piezoelectric Characteristics of the (Na,K)(Nb,Sb)O3 Ceramics as a Function of Na Excess Addition

Na 과잉 첨가에 따른 (Na, K)(Nb, Sb)O3 세라믹스의 유전 및 압전 특성

  • Seo, Bueong-Ho (Department of Electrical Engineering, Semyung University) ;
  • Lee, Kab-Soo (Department of Electrical Engineering, Semyung University) ;
  • Yoo, Ju-Hyun (Department of Electrical Engineering, Semyung University)
  • Received : 2011.01.11
  • Accepted : 2011.03.21
  • Published : 2011.04.01

Abstract

In this study, lead-free $(K_{0.5}Na_{0.5+X})(Nb_{0.96}Sb_{0.04})O_3+0.2mol%La_2O_3+1.2mol%$ $K_4CuNb_8O_{23}$ (X= 0~0.025) ceramics were fabricated by normal sintering method at $1060^{\circ}C$ for 5 h. Microstructures, piezoelectric and dielectric properties of specimens were investigated with special emphasis in the influence of Na excess addition. The grain size of specimen was slightly decreased with increasing Na content. In the 2 [mol%] Na excess addition of NKNS ceramics, density, electromechanical coupling factor, piezoelectric constant and electromechancal quality factor of specimen were found to reach the optimum values of 4.25 [$g/cm^3$], 0.4357, 154.43 [pC/N] and 580, respectively.

Acknowledgement

Supported by : KETEP, NRF

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