期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.257601
关键词
-
资金
- National Natural Science Foundations of China [20931002, 21101026, 21210005, 21290172]
A supramolecular adduct 4-methoxyanilinium perrhenate 18-crown-6 was synthesized, which under-goes a disorder-order structural phase transition at about 153 K (T-c) due to slowing down of a pendulumlike motion of the 4-methoxyanilinium group upon cooling. Ferroelectric hysteresis loop measurements give a spontaneous polarization of 1: 2 mu C/cm(2). Temperature-dependent solid-state nuclear magnetic resonance measurements reveal three kinds of molecular motions existing in the compound: pendulumlike swing of 4-methoxyanilinium cation, rotation of 18-crown-6 ring, and rotation of the methoxyl group. When the temperature decreases, the first two motions are frozen at about 153 K and the methoxyl group becomes rigid at around 126 K. The slowing down or freezing of pendulumlike motion of the cation triggered by temperature decreasing corresponds to the centrosymmetric-to-noncentrosymmetric arrangement of the compound, resulting in the formation of ferroelectricity.
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