Tuning ferroelectric phase transition temperature by enantiomer fraction
Chang‐Chun Fan, Chengdong Liu, Bei‐Dou Liang, Wei Wang, Ming‐Liang Jin, Chao‐Yang Chai, Chang‐Qing Jing, Tong‐Yu Ju, Xiang‐Bin Han, Wen Zhang
Abstract
Abstract Tuning phase transition temperature is one of the central issues in phase transition materials. Herein, we report a case study of using enantiomer fraction engineering as a promising strategy to tune the Curie temperature ( T C ) and related properties of ferroelectrics. A series of metal-halide perovskite ferroelectrics ( S −3AMP) x ( R −3AMP) 1−x PbBr 4 was synthesized where 3AMP is the 3-(aminomethyl)piperidine divalent cation and enantiomer fraction x varies between 0 and 1 (0 and 1 = enantiomers; 0.5 = racemate). With the change of the enantiomer fraction, the T C , second-harmonic generation intensity, degree of circular polarization of photoluminescence, and photoluminescence intensity of the materials have been tuned. Particularly, when x = 0.70 − 1, a continuously linear tuning of the T C is achieved, showing a tunable temperature range of about 73 K. This strategy provides an effective means and insights for regulating the phase transition temperature and chiroptical properties of functional materials.