Enhanced pyroelectric response from domain-engineered lead-free (K0.5Bi0.5TiO3-BaTiO3)-Na0.5Bi0.5TiO3 ferroelectric ceramics
Enhanced pyroelectric response from domain-engineered lead-free (K0.5Bi0.5TiO3-BaTiO3)-Na0.5Bi0.5TiO3 ferroelectric ceramics
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DOI：
10.1016/j.jeurceramsoc.2020.11.013
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发表时间：
2020-11
影响因子：
5.7
通讯作者：
Atul Thakre;D. Maurya;Do Yoen Kim;Yunseok Kim;P. Sriboriboon;Il-Ryeol Yoo;S. Priya;K. Cho;H. Song;J. Ryu
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文献类型：
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作者：
Atul Thakre;D. Maurya;Do Yoen Kim;Yunseok Kim;P. Sriboriboon;Il-Ryeol Yoo;S. Priya;K. Cho;H. Song;J. Ryu
[001]晶粒取向、四方相、无铅的0.2(2/3K0.5Bi0.5TiO3-1/3BaTiO3)-0.8Na0.5Bi0.5TiO3（KBT-BT-NBT）陶瓷通过畴工程实现了增强的热释电响应。[001]晶体取向导致了四方对称的大极化；因此，沿着这个方向织构可以增强热电性。x射线衍射分析显示，沿[001]晶体学方向的Lotgering因子（织构度）为93%。在室温下，织构的KBT-BT-NBT无铅陶瓷的热释电性能与铅基铁电材料相当。除了在RT下的热释电响应增强外，在退极化温度下，由于相干180°的畴切换，铁电性向反铁电性的相变明显，热释电响应从1750 μC m−2K−1增强到90,900 μC m−2K−1。这些结果将激发广泛的无铅热释电器件的发展，如热传感器和红外探测器。
Enhanced pyroelectric response is achieved via domain engineering from [001] grain-oriented, tetragonal-phase, lead-free 0.2(2/3K0.5Bi0.5TiO3-1/3BaTiO3)-0.8Na0.5Bi0.5TiO3(KBT-BT-NBT) ceramics prepared by a templated grain growth method. The [001] crystallographic orientation leads to large polarization in tetragonal symmetry; therefore, texturing along this direction is employed to enhance the pyroelectricity. X-ray diffraction analysis revealed a Lotgering factor (degree of texturing) of 93 % along the [001] crystallographic direction. The textured KBT-BT-NBT lead-free ceramics showed comparable pyroelectric figures of merit to those of lead-based ferroelectric materials at room temperature (RT). In addition to the enhanced pyroelectric response at RT, an enormous enhancement in the pyroelectric response (from 1750 to 90,900 μC m−2K−1) was achieved at the depolarization temperature because of the sharp ferroelectric to antiferroelectric phase transition owing to coherent 180° domain switching. These results will motivate the development of a wide range of lead-free pyroelectric devices, such as thermal sensors and infra-red detectors.