Diffuse Phase Transitions and Giant Electrostrictive Coefficients in Lead-Free Fe3+-Doped 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 Ferroelectric Ceramics
Diffuse Phase Transitions and Giant Electrostrictive Coefficients in Lead-Free Fe3+-Doped 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 Ferroelectric Ceramics
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无铅Fe3掺杂0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3铁电陶瓷中的弥散相变和巨电致伸缩系数
DOI：
10.1021/acsami.6b08879
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发表时间：
2016-11-16
影响因子：
9.5
通讯作者：
Liu, Gang
中科院分区：
文献类型：
--
作者：
Jin, Li;Huo, Renjie;Liu, Gang
电致伸缩效应比压电效应具有温度稳定性和无磁滞特性等优点。本文报道了无铅Fe~(3+)掺杂0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7CaO_3)TiO_3(BZT-0.5BCT)铁电陶瓷的扩散相变和电致伸缩性能。掺杂浓度设定在0.25~2mol%之间。结果表明，在BZT-0.5BCT中引入Fe3+离子后，每摩尔分数Fe3+离子使介电常数最大值T-m对应的温度单调向低温移动37℃。同时，相变从经典的铁电相变到顺电相变逐渐转变为具有弱弛豫特性的扩散相变。在25~100℃温度范围内，掺入1-2mol%Fe~(3+)离子的样品的超电致伸缩系数Q(33)在0.04~0.05m(4)/C~(-2)之间。掺Fe~(3+)的BZT-0.5BCT陶瓷的Q(33)几乎是其他铁电陶瓷的两倍。这些观察结果表明，本系统可以被认为是一种潜在的无铅材料在电致伸缩领域的应用，并且BT基铁电陶瓷将比其他铁电系统具有巨大的电致伸缩系数。
The electrostrictive effect has some advantages over the piezoelectric effect, including temperature stability and hysteresis-free character. In the present work, we report the diffuse phase transitions and electrostrictive properties in lead-free Fe3+-doped 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7CaO3)TiO3 (BZT-0.5BCT) ferroelectric ceramics. The doping concentration was set from 0.25 to 2 mol %. It is found that by introducing Fe3+ ion into BZT-0.5BCT, the temperature corresponding to permittivity maximum T-m was shifted toward lower temperature monotonically by 37 degrees C per mol % Fe3+ ion. Simultaneously, the phase transitions gradually changed from classical ferroelectric-to-paraelectric phase transitions into diffuse phase transitions with a weak relaxor characteristic. Purely electrostrictive responses with giant electrostrictive coefficient Q(33) between 0.04 and 0.05 m(4)/C-2 are observed from 25 to 100 degrees C for the compositions doped with 1-2 mol % Fe3+ ion. The Q(33) of Fe3+-doped BZT-0.5BCT ceramics is almost twice the Q(33) of other ferroelectric ceramics. These observations suggest that the present system can be considered as a potential lead-free material for the applications in electrostrictive area and that BT-based ferroelectric ceramics would have giant electrostrictive coefficient over other ferroelectric systems.