4-(cyanomethyl)anilinium Perchlorate: A New Displacive-Type Molecular Ferroelectric

被引：137

作者：

Cai, Hong-Ling ^{[1
]}

Zhang, Wen ^{[1
]}

Ge, Jia-Zhen ^{[1
]}

Zhang, Yi ^{[1
]}

Awaga, Kunio ^{[2
,3
]}

Nakamura, Takayoshi ^{[4
]}

Xiong, Ren-Gen ^{[1
]}

机构：

[1] Southeast Univ, Ordered Matter Sci Res Ctr, Nanjing 211189, Peoples R China

[2] Nagoya Univ, Res Ctr Mat Sci, Nagoya, Aichi 4648601, Japan

[3] Nagoya Univ, Dept Chem, Nagoya, Aichi 4648601, Japan

[4] Hokkaido Univ, Res Inst Elect Sci, Sapporo, Hokkaido, Japan

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 14期

关键词：

ROOM-TEMPERATURE FERROELECTRICITY; CRYSTALS;

D O I：

10.1103/PhysRevLett.107.147601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new organic ferroelectric compound, 4-(cyanomethyl) anilinium perchlorate, proceeds a second-order phase transition from a paraelectric phase (P2(1)/m) to a ferroelectric phase (P2(1)) at 184 K. A perfect ferroelectric hysteresis loop was observed even at 10 KHz. It is the first example of a molecule-based organic ferroelectric whose polarization can be switched at such a high frequency. The temperature dependent second harmonic generation effect shows that the second-order nonlinear coefficient is nearly zero above T-c and proportional to the spontaneous polarization below T-c, suggesting the occurrence of symmetry breaking, in good agreement with crystal structural determination. The origin of ferroelectricity was ascribed to the displacements of -NH3+ cations and ClO4- anions from the symmetric positions including a small part of the order-disorder behaviors of the ClO4- anions.

引用

页数：5

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