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A Displacive‐Type Metal Crown Ether Ferroelectric Compound: Ca(NO 3 ) 2 (15‐crown‐5)
Author(s) -
Ye HengYun,
Zhang Yi,
Fu DaWei,
Xiong RenGen
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201402339
Subject(s) - ferroelectricity , dielectric , differential scanning calorimetry , crown ether , chemistry , crystallography , phase transition , condensed matter physics , materials science , physics , optoelectronics , ion , organic chemistry , thermodynamics
Following the Curie symmetry principle and Aizu rule, we discovered there is a centrosymmetric‐to‐noncentrosymmetric phase transition in Ca(NO 3 ) 2 (15‐crown‐5) at T c =205 K. The transition was confirmed by differential scanning calorimetry and second harmonic generation measurements. The transition gives rise to excellent ferroelectricity, such as a giant dielectric anomaly, with faster polarization switching (5×10 −5 s) of up to 10 7 times without showing fatigue. The ferroelectric mechanism is attributable to the coordination environmental distortion of the central Ca atom. This finding can throw light on the further research in metal–organic ferroelectrics.