Da-Wei Fu

TL;DR: Organic-inorganic perovskite enantiomorphic ferroelectrics, (R)- and (S)-3-(fluoropyrrolidinium)MnBr3, undergoing a 222F2 type ferroelectric phase transition at 273 K are reported, which is the first molecular ferroElectric with CPL activity.

TL;DR: Combined with those advantages of molecular ferroelectrics, such as light weight, easy and environment-friendly processing, and mechanical flexibility, (ATHP)2PbBr4 would be a competitive candidate for next-generation smart piezoelectric sensors in flexible devices, soft robotics, and biomedical devices.

TL;DR: Imidazolium periodate (IPI) is found to be an improper ferroelectric that shows bistable properties simultaneously in three channels of dielectricity, piezoelectricities, and second-harmonic generation within the temperature window 300-310 K.

TL;DR: Temperature-dependent solid-state nuclear magnetic resonance measurements reveal three kinds of molecular motions existing in the compound: pendulumlike swing of 4-methoxyanilinium cation, rotation of 18-crown-6 ring, and rotation of the methoxyl group, which corresponds to the centrosymmetric-to-noncentrosy mmetric arrangement of the compound, resulting in the formation of ferroelectricity.

TL;DR: Systematic characterizations reveal that the centrosymmetric-to-polar phase transition at T2 is a paraelectric- to-ferroelectric transition and symmetry breaking was also confirmed by temperature-dependent second-harmonic generation effect and X-ray powder diffraction.