High Dielectric Constant and Large Electromechanical Coupling Factor Relaxor-Based Piezoelectric Ceramics

概要

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Lead-perovskite multicomponent system ceramics Pb(Sc1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-Pb(Ni1/3Nb2/3)O3-(Pb,Sr)(Zr,Ti)O3 (PSN-PMN-PNN-PSZT) with high dielectric constant ${\varepsilon_{33}}^{\text{T}}/\varepsilon_{0}=7{,}200$ and large sliver mode electromechanical coupling factor (EMCF) ${k_{33}}'=69$% near the morphotropic phase boundary (MPB) were synthesized by a conventional solid-state-reaction process. To obtain high dielectric constant ${\varepsilon_{33}}^{\text{T}}/\varepsilon_{0}>7{,}000$, a large EMCF and piezoelectric constant materials, a low-molecular-mass (LMM) B-site ion model in lead perovskite is applied to realize better dielectric and piezoelectric properties. We focused on complex perovskite system ceramics PSN-PMN-PNN-PSZT, which consist of four LMM B-site elements, such as, Sc, Mg, Ni and Nb. The maximum dielectric constants, ${\varepsilon_{33}}^{\text{T}}/\varepsilon_{0}=7{,}200$ and ${\varepsilon_{33}}^{\text{S}}/\varepsilon_{0}=3{,}200$, are confirmed in the PSN-PMN-PNN-PSZT ceramics. These ceramic show an planar-mode EMCF $k_{p}=69$%, piezoelectric constant $d_{33}=940$ pC/N and Curie temperature $T_{\text{c}}=135$°C. The dielectric and piezoelectric properties of these ceramics are studied for the ultrasonic medical array transducer application.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-09-15