A Displacive‐Type Metal Crown Ether Ferroelectric Compound: Ca(NO3)2(15‐crown‐5)1. Issue 26 (20th May 2014)

• Record Type: Journal Article
• Authors: Ye, Heng‐Yun; Zhang, Yi; Fu, Da‐Wei; Xiong, Ren‐Gen
• Is Part Of: Angewandte Chemie international edition. Volume 53:Issue 26(2014)
• Page Start: 6724
• Page End: 6729
• Publication Date: 2014-05-20
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201402339
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Following the Curie symmetry principle and Aizu rule, we discovered there is a centrosymmetric‐to‐noncentrosymmetric phase transition in Ca(NO₃)₂(15‐crown‐5) at <italic>T</italic>_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 10⁷ 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.</p> </abstract>