An organic plastic ferroelectric with high Curie point

Plastic ferroelectrics, featuring large entropy changes in phase transitions, hold great potential application for solid-state refrigeration due to the electrocaloric effect. Although conventional ceramic ferroelectrics ( e.g. , BaTiO 3 and KNbO 3 ) have been widely investigated in the fields of ele...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2022-01, Vol.13 (3), p.748-753
Main Authors: Ai, Yong, Li, Peng-Fei, Yang, Meng-Juan, Xu, Yu-Qiu, Li, Meng-Zhen, Xiong, Ren-Gen
Format: Article
Language:English
Subjects:
Barium titanates
Chemistry
Chirality
Curie temperature
Electric fields
Entropy
Environmental protection
Ferroelectric materials
Ferroelectricity
Ferroelectrics
Functional materials
Hysteresis loops
Phase transitions
Polarization
Polystyrene resins
Potassium niobates
Room temperature
Thin films
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Summary:Plastic ferroelectrics, featuring large entropy changes in phase transitions, hold great potential application for solid-state refrigeration due to the electrocaloric effect. Although conventional ceramic ferroelectrics ( e.g. , BaTiO 3 and KNbO 3 ) have been widely investigated in the fields of electrocaloric material and catalysis, organic plastic ferroelectrics with a high Curie point ( T c ) are rarely reported but are of great importance for the sake of environmental protection. Here, we reported an organic plastic ferroelectric, (−)-camphanic acid, which crystallizes in the P 2 1 space group, chiral polar 2 (C 2 ) point group, at room temperature. It undergoes plastic paraelectric-to-ferroelectric phase transition with the Aizu notation of 23F2 and high T c of 414 K, showing large entropy gain (Δ S t = 48.2 J K −1 mol −1 ). More importantly, the rectangular polarization-electric field ( P - E ) hysteresis loop was recorded on the thin film samples with a large saturated polarization ( P s ) of 5.2 μC cm −2 . The plastic phase transition is responsible for its multiaxial ferroelectric feature. This work highlights the discovery of organic multiaxial ferroelectrics driven by the motive of combining chirality and plastic phase transition, which will extensively promote the practical application of such unique functional materials. An organic plastic ferroelectric, (−)-Camphanic acid, shows multiaxial ferroelectric feature and large entropy gain during the phase transition.
ISSN:2041-6520
2041-6539
DOI:10.1039/d1sc06781h