Phase Transition Temperatures and Piezoelectric Properties of (Bi1/2Na1/2)TiO3-and (Bi1/2K1/2)TiO3-Based Bismuth Perovskite Lead-Free Ferroelectric Ceramics
Phase Transition Temperatures and Piezoelectric Properties of (Bi1/2Na1/2)TiO3-and (Bi1/2K1/2)TiO3-Based Bismuth Perovskite Lead-Free Ferroelectric Ceramics
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DOI：
10.1109/tuffc.2009.1224
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
T. Takenaka;H. Nagata;Y. Hiruma
中科院分区：
文献类型：
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作者：
T. Takenaka;H. Nagata;Y. Hiruma
综述了(Bi1/2Na1/2)TiO3(BNT)和(Bi1/2Na1/2)TiO3(BKT)基铋钙钛矿型无铅铁电陶瓷的相变温度、介电、铁电和压电性能。根据我们课题组的研究结果，这些陶瓷可以被认为是减少环境破坏的优良的无铅压电材料。钙钛矿型陶瓷似乎适合于需要大的压电常数D33和高居里温度TC或高去极化温度Td(>；200℃)的致动器和大功率应用。本文综述了相变温度与压电性能之间的关系。在BNT基固溶体的情况下，三方相和四方相之间的准同型相界(MPB)处获得了最高的压电性能。然而，D33和TD被证明是一种权衡关系。考虑到高TD和高D33，MPB复合材料的四方边适合于压电驱动器的应用。同时，MPB组分方面侧的QM值要好于四方侧的QM值，并且具有菱形对称性的掺锰BNT-(Bi1/2Na1/2)TiO3-BKT三元体系具有优异的高功率特性。采用热压法制备了BKT陶瓷，并对其铁电和压电性能进行了研究。掺少量铋的BKT陶瓷具有较高的剩余极化Pr=27.6mUC/cm2和较高的压电性能(k33=0.40，d33=101pC/N)。此外，还澄清了BKT陶瓷具有大约300℃的高Td。固溶体(1-x)BKT-xBaTiO3(BKT-BT100x)在x&gT；0.4时表现出约300℃的高Td。
The phase transition temperatures and the dielectric, ferroelectric, and piezoelectric properties of bismuth perovskite lead-free ferroelectric ceramics such as (Bi1/2Na1/2)TiO3 (BNT)- and (Bi1/2Na1/2)TiO3 (BKT)-based solid solutions have been reviewed. According to the results obtained by our group, these ceramics can be considered as superior lead-free piezoelectric materials for reducing environmental damage. Perovskite-type ceramics appear to be suitable for actuator and high-power applications that require a large piezoelectric constant d33 and a high Curie temperature TC or a high depolarization temperature Td (> 200degC). In this paper, we summarize the relationship between phase transition temperatures and piezoelectric properties. In the case of the BNT-based solid solutions, the highest piezoelectric properties were obtained at the morphotropic phase boundary (MPB) between rhombohedral and tetragonal phases. However, d33 and Td were shown to have a tradeoff relationship. Considering the high Td and high d33, the tetragonal side of the MPB composition is suitable for piezoelectric actuator application. Meanwhile, the Qm values on the rhombohedral side of the MPB composition were better than those on the tetragonal side, and excellent high-power characteristics were obtained for Mn-doped BNT-(Bi1/2Na1/2)TiO3-BKT ternary systems with rhombohedral symmetry. BKT ceramics were prepared by the hot-pressing (HP) method, and their ferroelectric and piezoelectric properties were clarified. BKT ceramics doped with a small amount of Bi have a relatively high remanent polarization of Pr = 27.6 muC/cm2 and high piezoelectric properties (k33 = 0.40 and d33 = 101 pC/N). In addition, it was clarified that BKT ceramics have a high Td of approximately 300degC. The solid solution (1-x)BKT-xBaTiO3 (BKT-BT100x) exhibited a high Td of approximately 300degC at x > 0.4.