Ferroelectric P4mm to relaxor P4bm transition and temperature-insensitive large strains in Bi(Mg0.5Ti0.5)O3-modified tetragonal 0.875Bi0.5Na0.5TiO3-0.125BaTiO3 lead-free ferroelectric ceramics
Ferroelectric P4mm to relaxor P4bm transition and temperature-insensitive large strains in Bi(Mg0.5Ti0.5)O3-modified tetragonal 0.875Bi0.5Na0.5TiO3-0.125BaTiO3 lead-free ferroelectric ceramics
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DOI：
10.1016/j.jeurceramsoc.2017.12.022
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发表时间：
2018-04-01
影响因子：
5.7
通讯作者：
Hao, Jigong
中科院分区：
文献类型：
--
作者：
Li, Ling;Zhu, Mankang;Hao, Jigong
设计并采用传统固相法制备了（1-x）（0.875Bi（0.5）Na（0.5）TiO（3）-0.125BaTiO（3））-xBi（Mg0.5Ti0.5）O3无铅铁电材料。所有样品均为四方钙钛矿结构，随着BMT含量的增加，样品的相结构由铁电P4 mm向反铁电弛豫P4 bm转变。临界成分x = 0.04在两个四方相之间形成桥，并给出0.30%的大的场致应变和0.0254 m（4）/C-2的足够大的电致伸缩系数Q（33）。需要强调的是，x = 0.04的组合物的场致应变在18-100摄氏度的温度范围内显示出几乎恒定的值，说明了温度不敏感的行为，这可能归因于TR-E和TF-R之间的加宽的间隙。四元BNT-BT-BMT复合材料的温度不敏感大应变特性使其在精密位置驱动器中具有很好的应用前景。
Tetragonal phase (1-x)(0.875Bi(0.5)Na(0.5)TiO(3)-0.125BaTiO(3))-xBi(Mg0.5Ti0.5)O-3 lead-free ferroelectrics were designed and fabricated by a conventional solid state route. All the specimens exhibit a tetragonal perovskite structure, and undergo a phase evolution from ferroelectric P4mm to antiferroelectric relaxor P4bm as the BMT addition increases. The critical composition x = 0.04 makes a bridge between the both tetragonal phases, and gives a large field-induced strain of 0.30% and an adequately-large electrostrictive coefficient Q(33) of 0.0254 m(4)/C-2. To be highlighted, the field-induce strain of the composition x = 0.04 shows an almost constant value over the temperature range of 18-100 degrees C, illustrating a temperature-insensitive behavior, which could be attributed to the widened gap between TR-E and TF-R. The temperature-insensitive large strain of the tetragonal BNT-BT-BMT composition give a promising potential for application in precision position actuators.