Molecular Ferroelectric with Most Equivalent Polarization Directions Induced by the Plastic Phase Transition

被引:137
作者
Ye, Heng-Yun [1 ]
Ge, Jia-Zhen [1 ]
Tang, Yuan-Yuan [1 ]
Li, Peng-Fei [1 ]
Zhang, Yi [1 ]
You, Yu-Meng [1 ]
Xiong, Ren-Gen [1 ]
机构
[1] Southeast Univ, Ordered Matter Sci Res Ctr, Nanjing 211189, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
ROOM-TEMPERATURE FERROELECTRICITY; EFFICIENT; CRYSTALS;
D O I
10.1021/jacs.6b08817
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Besides the single crystals, ferroelectric materials are actually widely used in the forms of the polycrystals like ceramics. Multiaxial ferroelectrics with multiple equivalent polarization directions are preferable for such applications, because more equivalent ferroelectric axes allow random spontaneous polarization vectors to be oriented along the electric field to achieve a larger polarization after poling. Most of ceramic ferroelectrics like BaTiO3 have equivalent ferroelectric axes no more than three. We herein describe a molecular-ionic ferroelectric with 12 equivalent ferroelectric axes: tetraethylammonium perchlorate, whose number of axes is the most in the known ferroelectrics. Appearance of so many equivalent ferroelectric axes benefits from the plastic phase transition, because the plastic phase usually crystallizes in a highly symmetric cubic system. A perfect macroscopic ferroelectricity can be obtained on the polycrystalline film of this material. This finding opened an avenue constructing multiaxial ferroelectrics for applications as polycrystalline materials.
引用
收藏
页码:13175 / 13178
页数:4
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