Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Low-temperature Sintering of Lead-free $Bi_{1/2}(Na,K)_{1/2}TiO_3-based$ Electrostrictive Ceramics with CuO Addition

  • Kang, Jin-Kyu (School of Materials Science and Engineering, University of Ulsan) ;
  • Heo, Dae-Jun (School of Materials Science and Engineering, University of Ulsan) ;
  • Nguyen, Van Quyet (School of Materials Science and Engineering, University of Ulsan) ;
  • Han, Hyoung-Su (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan) ;
  • Ahn, Kyoung-Kwan (School of Mechanical Engineering, University of Ulsan)
  • Published : 2012.09.28
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Abstract

This study investigated low-temperature sintering of $(Bi_{1/2}Na_{1/2})TiO_3-based$ electrostrictive ceramics by employing CuO as a sintering aid. Ceramic specimens with a composition of $0.96Bi_{1/2}-(Na_{0.82}K_{0.18})_{1/2}TiO_3-0.04BaZrO_3$ were prepared using a conventional solid-state reaction route. Without CuO, specimens required sintering temperatures $(T_s)$ over $1175^{\circ}C$ for sufficient densification while the addition of 0.02-mol CuO in excess decreased the $T_s$ down to $1100^{\circ}C$. A normalized strain, $S_{max}/E_{max}$, of 363 pm/V was obtained for a CuO-added specimen after sintering at $1100^{\circ}C$, which was better than that of a high-temperature fired specimen sintered at $1175^{\circ}C$ without CuO (333 pm/V). The CuO-added specimen showed a high electrostrictive constant, $Q_{33}$, of $0.023m^{4}C^{-2}$, comparable to that of the $Pb(Mg_{1/3}Nb_{2/3})O_3$ (PMN) ceramic, which is believed to open a new road for the realization of low cost lead-free ceramic actuators.

Keywords

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