Two enantiomeric perovskite ferroelectrics with a high T-c raised by inserting intermolecular hydrogen bonds

abstract

Molecular ferroelectrics have promising potential as next-generation flexible electronic materials by the advantage of flexibility, structural tunability, and easy processability. However, an obstacle in expanding their promising applications is effectively raising the ferroelectric transition temperature (T-c) necessary for practical applications, especially under high-temperature operating conditions. Herein, taking the advantage of a hydroxyl group that could form stronger hydrogen bonds to insert/tune host-guest and guest-guest interactions, we employed the 3-hydroxypyrrolidine cation to construct two new enantiomeric hexagonal perovskite ferroelectrics, (R)-3-OH-(C4H9N)[CdCl3] and (S)-3-OH-(C4H9N)[CdCl3]. Both of them undergo a ferroelectric phase transition from C222(1) to P2(1) with a high T-c of 350 K, which is 110 K and 47 K higher than that of their parent compound (C4H10N)[CdCl3] (240 K) and F-substituted analogues (R/S)-3-F-(C4H9N)[CdCl3] (303 K), respectively. These findings well demonstrate that, besides the F-substitution strategy, an OH-substitution strategy provides an important and practical way in designing high-T-c ferroelectrics.

subject category

Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied

authors

Ye, H; Hu, WH; Xu, WJ; Zeng, Y; Chen, XX; Huang, RK; Zhang, WX; Chen, XM

our authors

Groups

acknowledgements

This work was supported by the NSFC (Grant Nos. 21722107, 21671202, 22071273, 21805312, and 21821003) and Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (Grant No. 2017BT01C161).

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