著者

Kim Jin-Soo Kim So-Jung Kim Ho-Gi LEE Duck-Chool UCHINO Kenji

出版者

社団法人応用物理学会

雑誌

Japanese journal of applied physics. Pt. 1, Regular papers & short notes (ISSN:00214922)

巻号頁・発行日

vol.38, no.3, pp.1433-1437, 1999-03-15

参考文献数

16

被引用文献数

16

---

High-power piezoelectric materials are presently being extensively developed for applications such as ultrasonic motors and piezoelectric transformers. In this study, the piezoelectric and dielectric properties of Fe_2O_3-doped 0.57Pb(Sc_<1/2>Nb_<1/2>)O_3-0.43PbTiO_3 (hereafter 0.57PSN-0.43PT), which is the morphotropic phase boundary composition of the PSN-PT system, were investigated. The maximum dielectric constant (ε_<33>/ε_0=2551) and the minimum dielectric loss (tanδ = 0.51%) at room temperature were obtained at Fe_2O_3 additions of 0.1 wt% and 0.3 wt%, respectively. The temperature dependence of the dielectric constant and the dielectric loss was measured between room temperature and 350℃. With the addition of Fe_2O_3, the piezoelectric constant d_<33> and electromechanical coupling factor k_p were slightly decreased, but the mechanical quality factor Q_m was significantly increased. The highest mechanical quality factor (Q_m = 297) was obtained at 0.3 wt% Fe_2O_3, which is 4.4 times higher than that of nondoped 0.57PSN-0.43PT ceramics. The P-E and S-E loops of the samples at room temperature and at 1.0 Hz were measured at the same time using an automated polarization measuring system.