Microstructure and Piezoelectric Properties of ZnO-added (Na0.5K0.5)NbO3 Ceramics

概要

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The orthorhombic structure of (Na0.5K0.5)NbO3 (NKN) ceramics was maintained when ZnO was added. NKN ceramics have a porous microstructure and dissolve when they are exposed to water. However, as ZnO was added, a dense microstructure was developed and deliquescence was not observed. The mechanical quality factor ($Q_{\text{m}}$) and coercive field ($E_{\text{c}}$) increased with the addition of ZnO, indicating that ZnO acted as a hardener in the NKN ceramics. The dielectric constant ($\varepsilon^{\text{T}}{}_3/\varepsilon_{\text{o}}$), piezoelectric constant ($d_{33}$) and electromechanical coupling factor ($k_{\text{p}}$) increased when a small amount of ZnO was added, which might be due to the increase in density. The good dielectric and piezoelectric properties of $\varepsilon^{\text{T}}{}_3/\varepsilon_{\text{o}} = 500$, $d_{33} = 121$ and $k_{\text{p}}=0.4$ were obtained for the NKN ceramics with 1.0 mol% ZnO.
Japan Society of Applied Physicsの論文
2004-08-15