Abstract

In this study, Pb(Mg_1/3Nb_2/3)_0.65Ti_0.35O₃ (PMNT) ceramics were prepared by a water-based gel-casting method. The gel-cast mixtures were dried through soaking in acetone with different soaking times (7, 10, 13, 16 and 19 days). Effects of acetone soaking times on phase, density, microstructure, dielectric, ferroelectric and piezoelectric properties of prepared ceramics were aimed to investigate. Acetone soaking time did not affect crystal structure and density of the prepared ceramics. Average grain size increased doubly as acetone soaking time raised up to 13 days. With increasing acetone soaking time, dielectric constant tended to increase while loss tangent decreased. The acetone soaking time of 7 days was found to be an optimum time period for drying gel-cast mixture which led to PMNT ceramics with optimum ferroelectric and piezoelectric properties, i.e. P_r, E_c, d₃₃ and g₃₃ of 21.8 µC/cm², 7.8 kV/cm, 306 pC/N and 20.8 × 10⁻³ V⋅m/N, respectively, which were comparable to PMNT ceramics formed by dry-pressing technique.

摘要

在本研究中，Pb（Mg _1/3 Nb _2/3）_0.65 Ti _0.35 O ₃（PMNT）陶瓷是通过水基凝胶浇铸法制备的。通过以不同的浸泡时间（7、10、13、16和19天）浸泡在丙酮中干燥凝胶浇铸的混合物。目的研究丙酮浸泡时间对制备陶瓷的相，密度，微观结构，介电，铁电和压电性能的影响。丙酮浸泡时间不影响所制备陶瓷的晶体结构和密度。随着丙酮浸泡时间延长至13天，平均晶粒尺寸成倍增加。随着丙酮浸泡时间的增加，介电常数趋于增加，而损耗角正切降低。发现丙酮浸泡时间为7天是干燥凝胶浇铸混合物的最佳时间，这将导致PMNT陶瓷具有最佳的铁电和压电特性，即P_[R，E _Ç，d ₃₃和克₃₃ 21.8μC/厘米²，7.8千伏/厘米，306 PC / N和20.8×10 ^-3 V⋅m/ N，分别，这是与通过干法形成的陶瓷PMNT压制技术。